sender.js will on a tls failure try a delivery with out tls. However … #393
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…on freebsd 13 a misconfigured server may show
35242434560:error:1408F10B:SSL routines:ssl3_get_record:wrong version number:/usr/src/crypto/openssl/ssl/record/ssl3_record.c:339: But this is not detected as a tls failure and the delivery does not succeed. sender.js has been updated for this error