We recently moved to new office. I had a consultant set up the firewall. He was supposed to configure it exactly as the old one. He didn't and now he can not be reached.
Our MX record points to a SPAM filtering company. They then send our mail to us. For the first day they could not send us any mail. Then I finally got the consultant to put in a change to fix it. This morning I received this message from the SPAM company.
Still having issues delivering mail to your server consistently. I currently have 85 messages in queue for your domain. They have been slowly climbing.
I see most mail is going through ok but some seems to be getting an error from your server/firewall:
2011-03-23T16:34:40.351358-04:00 dpout01 postfix/smtp: 4E9E41C781FB: to=<email@example.com>, relay=mail.rgrayclamps.com[18.104.22.168]:25, delay=1013, delays=680/0/0.1/333, dsn=4.4.2, status=deferred (lost connection with mail.rgrayclamps.com[22.214.171.124] while sending end of data -- message may be sent more than once)
If you have ‘smtp fixup’ set on your firewall, you will want to disable that, it definitely could cause these types of issues.
I do not have smtp fixup set on the firewall.