Log:
Feb 21 12:13:15 localhost postfix/pickup[4368]: C2657123290: uid=497 from=
Feb 21 12:13:15 localhost postfix/cleanup[4491]: C2657123290: message-id=20180221171315.C2657123290@FreePBX
Feb 21 12:13:15 localhost postfix/qmgr[4369]: C2657123290: from=[email protected], size=476, nrcpt=1 (queue active)
Feb 21 12:13:15 localhost postfix/smtp[4493]: connect to smtp.office365.com[2603:1036:902:106::2]:587: Network is unreachable
Feb 21 12:13:15 localhost postfix/smtp[4493]: connect to smtp.office365.com[2603:1036:102:90::2]:587: Network is unreachable
Feb 21 12:13:15 localhost postfix/smtp[4493]: connect to smtp.office365.com[2603:1036:404:a2::2]:587: Network is unreachable
Feb 21 12:13:15 localhost postfix/smtp[4493]: connect to smtp.office365.com[2603:1036:902:108::2]:587: Network is unreachable
Feb 21 12:13:15 localhost postfix/smtp[4493]: connect to smtp.office365.com[2603:1036:405:5f::2]:587: Network is unreachable
Feb 21 12:13:15 localhost postfix/smtp[4493]: C2657123290: to=[email protected], relay=none, delay=0.06, delays=0.02/0/0.04/0, dsn=4.4.1, status=deferred (connect to smtp.office365.com[2603:1036:405:5f::2]:587: Network is unreachable)
Seems to me there were some questions about that a few weeks ago, and (working from memory) the consensus was to disable IPv6 for systems using Office365.
Either one of the results dicko pointed you to (if you don’t mind disabling IPV6 entirely, if you don’t even use in on your internal network) or add this to /etc/postfix/main.cf
Thanks, That brings up an interesting point… How IPv6 is FreePBX in general? Since the default appears to be IPv6 on, is FreePBX IPv6 ready? Also, the Sys Admin/Office365 button, clearly is not a working option as is. Someone who understands the best overall solution may want to recommend a fix.