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Add a newline before the first boundary. #50

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Add a newline before the first boundary. #50

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Commits on Nov 7, 2024

  1. Add a newline before the first boundary. 

    This is required for less flexible SMTPs (like Amazon SES), as explained in section 7.2.1 of the RFC (https://www.w3.org/Protocols/rfc1341/7_2_Multipart.html).

Without it, e-mail sending can fail with "554 Transaction failed: Duplicate header 'Content-Type'".

Tested with the Esp8266GMailTestSetName example using Amazon SES and GMail accounts.
    @adrcunha
    adrcunha committed Nov 7, 2024
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