Alex: > Aug 6 09:44:20 smtp01 postfix/smtp[24772]: setting up TLS connection > to mail.messaging.microsoft.com > Aug 6 09:44:20 smtp01 postfix/smtp[24772]: Peer verification: > CommonName in certificate does not match: > mail.global.frontbridge.com != mail.messaging.microsoft.com
The certificate CommonName is mail.global.frontbridge.com. This is easily demonstrated with $ openssl s_client -connect 65.55.88.22:25 -starttls smtp Why do you believe that the server certificate has MULTIPLE names? Wietse