I have been using claws-mail for several years. After I changed the server used for sending mail, receiving has continued to work but not sending.
When I closed claws-mail after a failure, my screen displayed > Warning SSL connection failed (A TLS packet with > unexpected length was received) > Warning couldn't start TLS session I reproduce below part of ./claws-mail/claws.log Any advice on how to fix things would be appreciated. [11:12:41] * message: Account 'c-bl...@imap.illinois.edu': Connecting to IMAP4 server: imap.illinois.edu... ... [11:12:41] IMAP4> Logging c-blair to imap.illinois.edu using LOGIN [11:12:42] IMAP4< LOGIN completed. [11:12:42] IMAP4< Login to imap.illinois.edu successful [11:12:42] IMAP4< 5 OK [READ-WRITE] SELECT completed. [11:12:42] IMAP4- [fetching UIDs...] [11:12:42] IMAP4< 6 OK FETCH completed. [11:12:42] IMAP4> 8 NOOP [11:12:42] IMAP4< 8 OK NOOP completed. [11:12:42] IMAP4> 9 UID STORE 6854 +FLAGS.SILENT (\Seen) [11:12:42] IMAP4< 9 OK STORE completed. [11:12:42] * message: Account 'c-bl...@imap.illinois.edu': Connecting to SMTP server: smtp.illinois.edu ... [11:12:42] SMTP< 220 smtp.illinois.edu Microsoft ESMTP MAIL Service ready at Mon, 13 Mar 2017 11:12:41 -0500 [11:12:42] ESMTP< 250-smtp.illinois.edu Hello [192.17.23.217] [11:12:42] ESMTP< 250-STARTTLS [11:12:42] ESMTP> STARTTLS [11:12:42] ESMTP< 220 2.0.0 SMTP server ready [11:12:42] ** warning: couldn't start TLS session [11:12:42] *** error: Error occurred while sending the message.
