Shared file email notifications not going out

User shares file with 2nd user, but 2nd user never gets email notification.
Email notifications enabled.
Port 25 open on firewall.
PostFix log shows connection refused on send requests.

Reassigned email notifications from the PostFix/local host to be sent from the actual email server that connected to external Spam filter.  Filr connected of the Email system, and relayed the notifications from there, to the external Spam filter since it was a known IP address.

PostFix was trying to connect to external Spam filter to have the email notification relayed, but the Spam Filter was blocking the request, most likely since it was from a unknown IP.

Post Fix log examples

Broken example:
May 14 15:52:02 filrserver postfix/smtp[13972]: connect to gmail-smtp-in.l.google.com[74.125.142.26]:25: Connection refused
May 14 15:52:02 filrserver postfix/smtp[13972]: connect to alt1.gmail-smtp-in.l.google.com[173.194.74.26]:25: Connection refused
May 14 15:52:02 filrserver postfix/smtp[13972]: connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:400c:c01::1b]:25: Network is unreachable
May 14 15:52:03 filrserver postfix/smtp[13972]: EE29367D0A: to=<jdoe@gmail.com>, relay=none, delay=0.03, delays=0.02/0.01/0.01/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:400c:c01::1b]:25: Network is unreachable)

Working example:
May 16 13:37:54 filrserver postfix/qmgr[12021]: 7582C67D08: from=<filr@filrtestlab.novell.com>, size=3772, nrcpt=1 (queue active)
May 16 13:37:55 filrserver postfix/smtp[22290]: connect to gmail-smtp-in.l.google.com[2607:f8b0:4003:c01::1b]:25: Network is unreachable
May 16 13:37:56 filrserver postfix/smtp[22290]: 7582C67D08: to=<jdoe@gmail.com>, relay=gmail-smtp-in.l.google.com[173.194.77.27]:25, delay=2, delays=0.13/0.12/1.1/0.64, dsn=2.0.0, status=sent (250 2.0.0 OK 1368733076 ry2si5303468oeb.21 - gsmtp)