Today I upgraded Thunderbird and then my SSL-connections to postfix did not work. In /var/log/mail.log i found the following:
SSL3_READ_BYTES:tlsv1 alert unknown ca:s3_pkt.c:1258:SSL alert number 48:
After a while i found this solutions
Just change the following thunderbird-setting:
security.use_mozillapkix_verification to false
