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Release Notes

MailKit 2.0.6

  • Fixed ImapFolder.GetSubfolders (StatusItems) to make sure that the child folders exist before calling STATUS on them when the server does not support the LIST-STATUS command.
  • Catch ArgumentExceptions when calling Encoding.GetEncoding(string). (issue #740)
  • Fixed parsing of IMAP threads where the root of a subtree is empty. (issue #739)
  • Added AuthorizationId property for PLAIN and DIGEST-MD5 SASL mechanisms.
  • Added MessageSummaryItems.Headers enum to fetch all headers. (issue #738)

MailKit 2.0.5

  • When throwing AuthenticationException within SmtpClient, add an SmtpCommandException as the InnerException property to help consumers diagnose authentication problems. (issue #717)
  • Added support for the authzid to the SASL PLAIN mechanism.
  • Modified ProtocolLogger file constructor to support Shared Read and an Append/Overwrite option. (issue #730)

MailKit 2.0.4

  • Fixed SmtpClient to use the IPv4 literal if the socket is IPv4 address mapped to IPv6. (issue #704)
  • Updated SmtpClient and ImapFolder.Append to use FormatOptions.EnsureNewLine. (MimeKit issue #251)

MailKit 2.0.3

  • Fixed IMAP IDLE support.
  • Ignore unknown tokens in IMAP untagged FETCH responses such as XAOL.SPAM.REASON.

MailKit 2.0.2

  • Added work-around for ProtonMail's IMAP server. (issue #674)
  • Added work-around for IMAP servers that do not include msgid in the ENVELOPE response. (issue #669)
  • Added MessageSummaryItems.PreviewText to allow fetching a small preview of the message. (issue #650)
  • Added support for batch fetching IMAP message streams. (issue #650)

MailKit 2.0.1

  • Obsoleted all SaslMechanism constructors that took a Uri argument and replaced them with variants that no longer require the Uri and instead take a NetworkCredential or a set of strings for the user name and password. This simplifies authenticating with OAuth 2.0:
var oauth2 = new SaslMechanismOAuth2 (username, auth_token);

client.Authenticate (oauth2);

MailKit 2.0.0

  • Updated MailKit to fully support async IO instead of using Task.Run() wrappers.
  • Fixed a resource leak when fetching IMAP body parts gets an exception.
  • Fixed each of the Client.Connect() implementtions to catch exceptions thrown by IProtocolLogger.LogConnect().
  • Removed the ImapFolder.MessagesArrived event.
  • Added new Authenticate() methods that take a SaslMechanism to avoid the need to manipulate Client.AuthenticationMechanisms in order to tweak which SASL mechanisms you'd like the client to use in Authenticate().
  • Added new SslHandshakeException with a helpful error message that can be thrown by the Connect() methods. This replaces the obscure SocketExceptions previously thrown by SslStream.
  • Fixed support for the IMAP UTF8=ACCEPT extension.
  • Improved ImapFolder.CommitStream() API to provide section, offset and length.
  • Treat the SMTP X-EXPS capability in an EHLO response the same as AUTH. (issue #603)
  • Dropped support for .NET 4.0.

Note: As of 2.0, XOAUTH2 is no longer in the list of SASL mechanisms that is tried when using the Authenticate() methods that have existed pre-MailKit 2.0. Instead, you must now use Authenticate(SaslMechanism, CancellationToken).

An example usage might look like this:

// Note: The Uri isn't used except with ICredentials.GetCredential (Uri) so unless
// you implemented your own ICredentials class, the Uri is a dummy argument.
var uri = new Uri ("imap://imap.gmail.com");
var oauth2 = new SaslMechanismOAuth2 (uri, username, auth_token);

client.Authenticate (oauth2);

MailKit 1.22.0

  • Enable TLSv1.1 and 1.2 for .NETStandard.
  • Read any remaining literal data after parsing headers. Fixes an issue when requesting specific headers in an ImapFolder.Fetch() request if the server sends an extra newline.

MailKit 1.20.0

  • Fixed UniqueIdRange.ToString() to always output a string in the form ${start}:${end} even if start == end. (issue #572)

MailKit 1.18.1

  • Gracefully handle IMAP COPYUID resp-codes without src or dest uid-set tokens. (issue #555)
  • Be more lenient with unquoted IMAP folder names containing ']'. (issue #557)

MailKit 1.18.0

  • Improved logic for cached FolderAttributes on ImapFolder objects.
  • If/when the \NonExistent flag is present, reset ImapFolder state as it probably means another client has deleted the folder.
  • Added work-around for home.pl which sends an untagged * [COPYUID ...] response without an OK (technically, the COPYUID resp-code should only appear in the tagged response, but accept it anyway).

MailKit 1.16.2

  • Added a leaveOpen param to the ProtocolLogger .ctor. (issue #506)
  • Added a CheckCertificateRevocation property on MailService. (issue #520)
  • Fixed ImapFolder to update the Count property and emit CountChanged when the IMAP server sends an untagged VANISHED response. (issue #521)
  • Fixed ImapEngine to properly handle converting character tokens into strings. (issue #522)
  • Fixed SmtpClient to properly handle DIGEST-MD5 auth errors in order to fall back to the next authentication mechanism.
  • Fixed Pop3Client to properly detect APOP tokens after arbitrary text. (issue #529)
  • Disabled NTLM authentication since it often doesn't work properly. (issue #532)

MailKit 1.16.1

  • Properly handle a NIL body-fld-params token for body-part-mpart. (issue #503)

MailKit 1.16.0

  • Improved IMAP ENVELOPE parser to prevent exceptions when parsing invalid mailbox addresses. (issue #494)
  • Fixed UniqueId and UniqueIdRange to prevent developers from creating invalid UIDs and ranges.
  • Fixed ImapFolder.FetchStream() to properly emit MODSEQ changes if the server sends them.
  • Fixed SmtpClient to call OnNoRecipientsAccepted even in the non-PIPELINE case. (issue #491)

MailKit 1.14.0

  • Improved IMAP's BODYSTRUCTURE parser to sanitize the Content-Disposition values. (issue #486)
  • Improved robustness of IMAP's BODYSTRUCTURE parser in cases where qstring tokens have unescaped quotes. (issue #485)
  • Fixed IMAP to properly handle NIL as a folder name in LIST, LSUB and STATUS responses. (issue #482)
  • Added ImapFolder.GetHeaders() to allow developers to download the entire set of message headers.
  • Added SMTP support for International Domain Names in email addresses used in the MAIL FROM and RCPT TO commands.
  • Modified SmtpClient to no longer throw a NotSupportedException when trying to send messages to a recipient with a unicode local-part in the email address when the SMTP server does not support the SMTPUTF8 extension. Instead, the local-part is passed through as UTF-8, leaving it up to the server to reject either the command or the message. This seems to provide the best interoperability.

MailKit 1.12.0

  • Allow an empty string text argument for SearchQuery.ContainsHeader(). (issue #451)
  • Fixed SaslMechanism.IsProhibited() logic to properly use logical ands. Thanks to Stefan Seering for this fix.

MailKit 1.10.2

  • Added an IsAuthenticated property to IMailService.
  • Fixed the ImapFolder.Quota class to not be public.

MailKit 1.10.1

  • Modified the ImapClient to always LIST the INBOX even if it is a namespace in order to get any flags set on it.
  • Fixed ImapFolder to handle Quota Roots that do not match an existing folder. (issue #433)
  • Added work-around for Courier-IMAP sending "* 0 FETCH ..." on flag changes. (issue #428)
  • Updated MessageSorter to be smarter about validating arguments such that it will only check for IMessageSummary fields that it will actually need in order to perform the specified sort.
  • Fixed SmtpClient.Authenticate() to throw an AuthenticationException with a message from the SMTP server if available.

MailKit 1.10.0

  • Added SearchQuery.Uids() to allow more powerful search expressions involving sets of uids.
  • Changed ImapClient.GetFolders() to return IList instead of IEnumerable.
  • Fixed a bug in MessageThreader.
  • Fixed bugs in Envelope.ToString() and Envelope.TryParse().
  • Fixed NTLM's Type2Message.Encode() logic to properly handle a null TargetInfo field.
  • Obsoleted some ImapFolder.Search() methods and replaced them with an equivalent ImapFolder.Sort() method.
  • Added a ResponseText property to ImapCommandException.
  • Fixed ImapFolder to emit a HighestModSeqChanged event when we get untagged FETCH responses with a higher MODSEQ value.
  • Improved SearchQuery optimization for IMAP.
  • Added SearchOptions.None.

MailKit 1.8.1

  • Fixed the NuGet packages to reference MimeKit 1.8.0.
  • Added an SmtpClient.QueryCapabilitiesAfterAuthenticating property to work around broken SMTP servers where sending EHLO after a successful AUTH command incorrectly resets their authenticated state.

MailKit 1.8.0

  • Added a new Search()/SearchAsync() to ImapFolder that take a raw query string.
  • Implemented support for the IMAP FILTERS extension and improved support for the METADATA extension.
  • Fixed NTLM authentication support to use NTLMv2. (issue #397)
  • Added support for IMAP's SEARCH=FUZZY relevancy scores.
  • Added an IMailFolder.ModSeqChanged event.
  • Added UniqueIdRange.All for convenience.

MailKit 1.6.0

  • Added support for the new IMAP LITERAL- extension.
  • Added support for the new IMAP APPENDLIMIT extension.
  • Fixed APOP authentication in the Pop3Client. (issue #395)
  • Reset the SmtpClient's Capabilities after disconnecting.
  • Modified ImapFolder.Search() to return a UniqueIdSet for IMAP servers that do not support the ESEARCH extension (which already returns a UniqueIdSet).
  • Added mail.shaw.ca to the list of SMTP servers that break when sending EHLO after AUTH. (issue #393)
  • Work around broken POP3 servers that reply "+OK" instead of "+" in SASL negotiations. (issue #391)
  • Modified the IMAP parser to properly allow "[" to appear within flag tokens. (issue #390)

MailKit 1.4.2.1

  • Fixed a regression in 1.4.2 where using a bad password in ImapClient.Authenticate() did not properly throw an exception when using a SASL mechanism. (issue #383)

MailKit 1.4.2

  • Properly initialize the private Uri fields in Connect() for Windows Universal 8.1. (issue #381, #382)
  • Added SecuritySafeCritical attributes to try and match base Exception in case that matters.
  • Added missing GetObjectData() implementation to Pop3CommandException.
  • Strong-name the .NET Core assemblies.
  • Make sure to process Alert resp-codes in ImapClient. (issue #377)

MailKit 1.4.1

  • Updated the NTLM SASL mechanism to include a Windows OS version in the response if the server requests it (apparently this should only happen if the server is in debug mode).
  • Updated the IMAP BODYSTRUCTURE parser to try and work around BODYSTRUCTURE responses that do not properly encode the mime-type of a part where it only provides the media-subtype token instead of both the media-type and media-subtype tokens. (issue #371)
  • Added smtp.dm.aliyun.com to the list of broken SMTP servers that failed to read the SMTP specifications and improperly reset their state after sending an EHLO command after authenticating (which the specifications explicitly state the clients SHOULD do). (issue #370)

MailKit 1.4.0

  • Added support for .NET Core 1.0

MailKit 1.2.24

  • Fixed logic for constructing the HELO command on WP8. (issue #351)
  • Modified ImapFolder.Search() to not send the optional CHARSET search param if the charset is US-ASCII. This way work around some broken IMAP servers that do not properly implement support for the CHARSET parameter. (issue #348)
  • Added more MailService methods to IMailService.

MailKit 1.2.23

  • Properly apply SecurityCriticalAttribute to GetObjectData() on custom Exceptions. (issue #340)

MailKit 1.2.22

  • Updated IMAP BODY parser to handle a NIL media type by treating it as "application".
  • Updated IMAP SEARCH response parser to work around search-return-data pairs within parens.
  • Added a missing SmtpStatusCode enum value for code 555. (issue #327)
  • Opened up more of the SearchQuery API to make it possible to serialize/deserialize via JSON. (issue #331)
  • Updated to reference BouncyCastle via NuGet.org packages rather than via project references.

MailKit 1.2.21

  • Replaced SmtpClient's virtual ProcessRcptToResponse() method with OnRecipientAccepted() and OnRecipientNotAccepted(). (issue #309)
  • Added MailService.DefaultServerCertificateValidationCallback() which accepts all self-signed certificates (a common operation that consumers want).
  • Fixed encoding and decoding of IMAP folder names that include surrogate pairs.
  • Fixed IMAP SEARCH logic for X-GM-LABELS.

MailKit 1.2.20

  • Added a work-around for GoDaddy's ASP.NET web host which does not support the iso-8859-1 System.Text.Encoding (used as a fallback encoding within MailKit) by falling back to Windows-1252 instead.
  • Improved NTLM support.

MailKit 1.2.19

  • Added support for the SMTP VRFY and EXPN commands.

MailKit 1.2.18

  • If the IMAP server sends a * ID NIL response, return null for ImapClient.Identify().
  • Allow developers to override the charset used when authenticating. (issue #292)

MailKit 1.2.17

  • Exposed MailKit.Search.OrderByType and MailKit.Search.SortOrder to the public API.
  • Modified IMailFolder.CopyTo() and MoveTo() to return a UniqueIdMap instead of a UniqueIdSet.
  • Improved ImapProtocolException error messages to be more informative.
  • Added an IsSecure property to ImapClient, Pop3Client and SmtpClient.
  • Fixed support for the IMAP COMPRESS=DEFLATE extension to work properly.
  • Modified UniqueId.Id and .Validity to be properties instead of fields.
  • Reduced memory usage for UniqueIdRange (-33%) and UniqueIdSet (-50%).
  • Vastly improved the performance of UniqueIdSet (~2x).
  • Added an ImapClient.GetFolders() overload that also requests the status of each folder.
  • Modified the headersOnly parameter to the various Pop3Client.GetStream() methods to default to false instead of forcing developers to pass in a value.
  • Updated the IMAP, POP3 and SMTP clients to be stricter with validating SSL certificates.

MailKit 1.2.16

  • Added support for the SCRAM-SHA-256 SASL mechanism.
  • Added support for the CREATE-SPECIAL-USE IMAP extension.
  • Added support for the METADATA IMAP extension.
  • Added support for the LIST-STATUS IMAP extension.

MailKit 1.2.15

  • Be more forgiving during SASL auth when a POP3 server sends unexpected text after a + response. (issue #268)

MailKit 1.2.14

  • Fixed ImapFolder.Search() to not capitalize the date strings in date queries. (issue #252)
  • Fixed filtering logic in ImapFolder.GetSubfolders() to not filter out subfolders named Inbox. (issue #255)
  • Exposed SmtpClient.ProcessRcptToResponse() as virtual protected to allow subclasses to override error handling. (issue #256)
  • Modified SmtpCommandException .ctors to be public and fixed serialization logic. (issue #257)
  • Added workaround for broken smtp.sina.com mail server.
  • Throw a custom ImapProtocolException on "* BYE" during connection instead of "unexpected token". (issue #262)

MailKit 1.2.13

  • Fixed SmtpClient to not double dispose the socket.
  • Added a BodyPartVisitor class.
  • Fixed ImapFolder to allow NIL tokens for body parts. (issue #244)

MailKit 1.2.12

  • Allow developers to specify a local IPEndPoint to use for connecting to remote servers. (issue #247)
  • Added support for NIL GMail labels. (issue #244)

MailKit 1.2.11.1

  • Fixed ImapFolder.GetSubfolders() to work with Yahoo! Mail and other IMAP servers that do not use the canonical INBOX naming convention for the INBOX folder. (issue #242)

MailKit 1.2.11

  • Fixed SmtpStream logic for determining if a call to ReadAhead() is needed. (issue #232)
  • Fixed ImapFolder.Close() to change the state to Closed even if the IMAP server does not support the UNSELECT command.
  • Allow the UIDVALIDITY argument to the COPYUID and APPENDUID resp-codes to be 0 even though that value is illegal. Improves compatibility with SmarterMail. (issue #240)

MailKit 1.2.10

  • Added an SslProtocols property to ImapClient, Pop3Client, and SmtpClient to allow developers to override which SSL protocols are to be allowed for SSL connections. (issue #229)
  • Added a work-around for GMail IMAP (and other IMAP servers) that sometimes send an illegal MODSEQ value of 0. (issue #228)

MailKit 1.2.9

  • Fixed ImapFolder.Append() methods to make sure to encode the message with line endings.
  • Added UniqueId.Invalid that can be used for error conditions.
  • Added UniqueId.IsValid property to check that the UniqueId is valid.
  • Added Opened and Closed events to IMailFolder.
  • Fixed the QRESYNC version of the IMailFolder.Open() method to take a uint uidValidity instead of a UniqueId uidValidity argument for consistency.
  • Updated MessageSorter.Sort() to be an extension method and added a List overload.
  • Updated MessageThreader.Thread() to be extension methods (required reordering of args).
  • Merged ISortable and IThreadable interfaces into IMessageSummary in order to remove duplicated properties and simplify things.
  • Renamed IMessageSummary.MessageSize to IMessageSummary.Size.
  • Modified IMessageSummary.UniqueId to no longer be nullable.
  • Added TextBody, HtmlBody, BodyParts and Attachments properties to IMessageSummary.
  • Modified the IMAP parser to allow NIL for the Content-Type and subtype strings in BODY and BODYSTRUCTURE values even though it is illegal. (issue #226)
  • Modified the IMAP parser to properly handle Message-Id tokens that are not properly encapsulated within angle brackets. (issue #224)
  • Fixed IMAP to properly deal with folder names that contained unescaped square brackets. (issue #222)

MailKit 1.2.8

  • Fixed ImapFolder to dispose the temporary streams used in GetMessage and GetBodyPart.
  • Added a MessageNotFoundException.
  • Added an ImapCommandResponse property to ImapCommandException.
  • Fixed SmtpClient to filter out duplicate recipient addresses in RCPT TO.
  • Modified MessageSorter/Threader to take IList arguments instead of OrderBy[].
  • Added support for parsing group addresses in IMAP ENVELOPE responses.
  • Disable SASL-IR support for the LOGIN mechanism. (issue #216)
  • Capture whether or not the IMAP server supports the I18NLEVEL and LANGUAGE extensions.

MailKit 1.2.7

  • Fixed ImapFolder.Rename() to properly emit the Renamed event for child folders as well.
  • Fixed ImapFolder.Fetch() to always fill in the Headers property when requesting specific headers even if the server replies with an empty list. (issue #210)

MailKit 1.2.6

  • Fixed UniqueIdSet.CopyTo() to work properly (also fixes LINQ usage).
  • Fixed ImapFolder.Status() where StatusItems.HighestModSeq is used.

MailKit 1.2.5

  • Added support for extended IMAP search options (see the SearchOptions flags).
  • Added TryParse() convenience methods for UniqueIdSet, UniqueIdRange, and UniqueId.
  • Added a workaround for a GMail IMAP BODYSTRUCTURE bug. (issue #205)
  • Added a ProtocolLogger property for ImapClient, Pop3Client, and SmtpClient.
  • Fixed the ImapFolder.GetStream() methods that take a BodyPart to call the proper overload.

MailKit 1.2.4

  • Updated SmtpClient to use MimeMessage.Prepare() instead of implementing its own logic.
  • Added a new ITransferProgress interface and updated IMAP, POP3 and SMTP methods to take an optional ITransferProgress parameter to allow for progress reporting.
  • Implemented client-side UID EXPUNGE for IMAP servers that do not support the UIDPLUS extension.
  • Improved API documentation.

MailKit 1.2.3

  • Fixed ImapFolder.AddFlags() to throw FolderNotOpenException if the folder is not opened in read-write mode. (issue #202)
  • Fixed ImapFolder.GetMessage/BodyPart/Stream() to not modify a dictionary while looping over it. (issue #201)
  • Fixed ImapFolder to throw FolderNotFoundException instead of ArgumentException when the command fails due to the folder not existing.

MailKit 1.2.2

  • Added ImapClient.GetFolders(FolderNamespace, ...) to allow getting the full (recursive) list of folders for a particular namespace.
  • Added a FolderAttributes.Inbox flag that gets set on the Inbox folder.
  • Fixed the IMAP code to properly treat the INBOX folder name case-insensitively.
  • Added ServiceNotConnectedException, ServiceNotAuthenticatedException, and FolderNotOpenException as a more specific errors than InvalidOperationException. (Note: they all subclass InvalidOperationException so old code continues to work).
  • Added Pop3Client.GetStream() to allow fetching messages or headers as an unparsed stream. (issue #198)
  • Fixed usage of Socket.Poll() to not loop 1000 times per second.
  • Added more ImapFolder.GetStream() overloads.
  • Added ImapFolder.CreateStream() and CommitStream() protected methods which are meant for subclasses that intend to implement caching.

MailKit 1.2.1

  • Added hooks to allow subclassing ImapFolder.

MailKit 1.2.0

  • Added new ImapFolder.GetStream() overloads that allow fetching only the TEXT stream.
  • Fixed ImapFolder.Search() to always treat the search results as UIDs even when the server (such as AOL) does not include the required UID tag in the ESEARCH response. (issue #191)
  • Fixed ImapClient to set the engine.Uri even for Windows81 profiles (fixes a NullReferenceException for the various Windows81 profiles). (issue #192)
  • Work around a GMail bug where it does not quote flags containing []'s. (issue #193)
  • Fixed the IMAP code to accept GMail label names that start with a '+'. (issue #195)
  • Delay throwing ProtocolException due to an unexpected disconnect when reading responses to PIPELINE'd SMTP commands in case one of the responses to those commands contains an error code that might hint at why the server disconnected. (issue #194)

MailKit 1.0.17

  • Fixed a STARTTLS regression in SmtpClient that was introduced in 1.0.15. (issue #187)

MailKit 1.0.16

  • Modified the Pop3Client to immediately query for the message count once the client is authenticated. This allows the Pop3Client to now have a Count property that replaces the need for calling GetMessageCount(). (issue #184)

MailKit 1.0.15

  • Added SearchQuery.HeaderContains() and obsoleted SearchQuery.Header() for API consistency.
  • Added workaround for GMail's broken FETCH command parser that does not accept aliases. (issue #183)

MailKit 1.0.14

  • Added a ServerCertificateValidationCallback property to all clients so that it is not necessary to set the global System.Net.ServicePointManager.ServerCertificateValidationCallback property.
  • Fixed MailService.Connect(Uri) to properly handle Uri's with Port value that had not been explicitly set. (issue #170)
  • Added logic to properly handle MODSEQ-based search responses. (issue #166 and issue #173)
  • When an ImapClient gets disconnected, if an ImapFolder was in an opened state, update its state to closed to prevent confusion once the ImapClient is reconnected.
  • Fixed a bug in Pop3Client.Authenticate() for servers that just reply with "+OK\r\n" to the SASL challenge. (issue #171)
  • Clear the POP3 capability flags if the POP3 server responds with -ERR at any time. Some servers will reply with a list of capabilities until the client is authenticated, and then reply with -ERR meaning that the client should not attempt to use previously listed capabilities. (issue #174)

MailKit 1.0.13

  • Added a FileName convenience property to BodyPartBasic which works the same way as the MimeKit.MimePart.FileName property.
  • Added a MessageSummaryFetched event to IMailFolder to better enable developers to both provide progress feedback to their users as well as enable them to better recover from exceptions (such as a dropped connection) occurring during the fetching of message summaries.
  • Added support for the IMAP SORT=DISPLAY extension.
  • Added a work-around for Cyrus IMAP 2.4.16 sending untagged SEARCH responses when untagged ESEARCH responses are expected.

MailKit 1.0.12

  • Fixed ImapFolder.GetMessage(), GetBodyPart() and GetStream() to throw an ImapCommandException rather than returning null if the server did not response with the message data.
  • Added new, much more usable, Connect() methods to ImapClient, Pop3Client, and SmtpClient that take a hostname, port, and SecureSocketOptions.
  • Added a workaround for smtp.strato.de's blatant disregard for standards. (issue #162)
  • Fixed ImapFolder.Close() to require ReadWrite access if expunge is true.
  • Fixed IMAP SORT queries to inject "RETURN" before the orderBy param. (issue #164)
  • Implemented support for the IMAP ACL extension.

MailKit 1.0.11

  • Make sure that the IMAP stream supports timeouts before using them (fixes a regression introduced in 1.0.10).
  • Added BodyParts and Attachments convenience properties to MessageSummary.
  • Added TextBody and HtmlBody convenience properties to MessageSummary.
  • Added ImapClient.IsAuthenticated, Pop3Client.IsAuthenticated and SmtpClient.IsAuthenticated properties.
  • Changed the ImapClient.Inbox property to throw InvalidOperationException if you try to access it before authenticating instead of returning null.
  • Added an ImapClient.IsIdle property to check if the ImapClient is currently in the IDLE state.

MailKit 1.0.10

  • Added support for the IMAP ID extension.

MailKit 1.0.9

  • Modified UniqueId to contain a Validity value. This allows ImapFolder.Append(), CopyTo(), and MoveTo() to provide the caller with a way to make sure that the UIDs are (still) valid in the destination folder at a future point in time.
  • Modified ImapFolder.UidValidity to be a uint instead of a UniqueId which not only makes more sense but also simplifies comparison.
  • Fixed GMail Label APIs to use the modified UTF-7 encoding logic meant for folder names as it appears that GMail wants label names to be encoded in this way. (issue #154)

MailKit 1.0.8

  • Fixed the SMTP BINARYMIME extension support to work properly. (issue #151)
  • Fixed ImapFolder.Open() to not set the PermanentFlags to None if another folder was open (preventing SetFlags/AddFlags/RemoveFlags from functioning properly). (issue #153)

MailKit 1.0.7

  • Marked Pop3Client methods that take UIDs as [Obsolete]. It is suggested that the equivalent methods that take indexes be used instead and that UID-to-index mapping is done by the developer. This takes the burden off of the Pop3Client to maintain a mapping of UIDs to indexes that it cannot easily maintain.
  • Fixed SmtpCommandException to only serialize the Mailbox property when it is non-null. (issue #148)
  • Fixed IMAP support to accept a UIDVALIDITY value of 0 (even though it is technically illegal) to work around a bug in SmarterMail 13.0. (issue #150)
  • Fixed ImapFolder.GetSubfolders() to filter out non-child folders from the list that it returns (once again, a work-around for a SmarterMail 13.0 bug). (issue #149)

MailKit 1.0.6

  • Fixed some issues revealed by source analysis.
  • Migrated the iOS assemblies to Xamarin.iOS Unified API for 64-bit support.

Note: If you are not yet ready to port your iOS application to the Unified API, you will need to stick with the 1.0.5 release. The Classic MonoTouch API is no longer supported.

MailKit 1.0.5

  • Added Connect() overloads which takes a Socket argument (issue #128).
  • Added support for SMTP Delivery Status Notifications (issue #136).
  • Modified the ImapFolder logic such that if the IMAP server does not send a PERMANENTFLAGS resp-code when SELECTing the folder, then it will assume that all flags are permanent (issue #140).

MailKit 1.0.4

  • Modified the IMAP BODYSTRUCTURE parser to allow NIL tokens for Content-Type and Content-Disposition parameter values. (issue #124)
  • Added ImapFolder.GetBodyPart() overrides to allow fetching body parts based on a part specifier string. (issue #130)

MailKit 1.0.3

  • Added a new ImapFolder.Fetch() overload that takes a HashSet of header fields to fetch instead of a HashSet for developers that need the ability to request custom headers not defined in the HeaderId enum.
  • Added an SmtpClient.MessageSent event and an OnMessageSent() method that can be overridden.

MailKit 1.0.2

  • Modified ProtocolLogger to flush the stream at the end of each Log().
  • Fixed IMAP SEARCH queries with empty string arguments.
  • Fixed the IMAP FETCH parser to accept qstrings and literals for header field names.
  • Improved documentation.

MailKit 1.0.1

  • Fixed Pop3Client.GetMessages (int startIndex, int count, ...) to use 1-based sequence numbers.
  • Fixed POP3 PIPELINING support to work as intended (issue #114).
  • Added a work-around for Office365.com IMAP to avoid ImapProtocolExceptions about unexpected '[' tokens when moving or copying messages between folders (issue #115).
  • Disabled SSLv3 for security reasons (POODLE), opting instead to use TLS.