How can I tell if my Exchange server is timing out or not accepting connections?
Posted on 2009-07-16
I have two MX records for my mail server, a primary(10) which points to my public IP address which is then NAT'd on the firewall to my server, and then a backup MX record(90) which points to my ISP's server in the event that our server is down, they will collect email until it is back up again. Anyways, we are able to send and receive email 24/7 just fine with no issues. An issue came up th other day where another domain behind our firewall can't send us email, it just get's "lost". Sometimes we get it hours or days later.....So my ISP said they checked their logs for their server and there's a TON of emails not getting through to us. Here's a sample from the log (all entries are the same error):
Jul 16 10:24:52 mailx mx/error: 5339EC9469: to=<email@example.com>, relay=none, delay=278907, delays=278907/0.03/0/0, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mail.mydomain.com[<MY PUBLIC IP>] while sending MAIL FROM)