User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36 Steps to reproduce: Thunderbird can't send mail via smtp.robots.org.uk (port 587 with STARTTLS). This happened relatively recently... the user re-installed Windows and presumably updated to a newer version of Thunderbird that doesn't want to talk to the server. Actual results: Client-side error: Sending of message failed. The message could not be sent using SMTP server smtp.robots.org.uk for an unknown reason. Please verify that your SMTP server settings are correct and try again, or contact your network administrator. Server-side error: 2015-01-12 23:09:30 TLS error on connection from foo.example ([192.168.x.x]) [x.x.x.x] (gnutls_handshake): A TLS fatal alert has been received.
Fixed this by removing tls_require_ciphers = SECURE128 from exim.conf. Client still needs a better error message though.
I'm getting this error as well, all of a sudden. Presumably it's a configuration change on the server, but "for an unknown reason" is a truly bad user experience. (In case it helps pinpoint the origin of "unknown errors" in the code, the server is postfix and it generates the log: warning: TLS library problem: error:14094412:SSL routines:SSL3_READ_BYTES:sslv3 alert bad certificate:s3_pkt.c:1275:SSL alert number 42: lost connection after STARTTLS from unknown[......])
Do you still see this issue when using a current version?
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