A while back Thunderbird stopped sending out mails because of some vague error message.
I guess the postfix server was not properly configured. What I did was to update/add the following config options:
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smtpd_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1 smtp_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1 smtpd_tls_protocols = !SSLv2,!SSLv3,!TLSv1 smtp_tls_protocols = !SSLv2,!SSLv3,!TLSv1 smtpd_tls_exclude_ciphers = aNULL, LOW, EXP, MEDIUM, ADH, AECDH, MD5, DSS, ECDSA, CAMELLIA128, 3DES, CAMELLIA256, RSA+AES, eNULL |