Exchange 2003 Outgoing SMTP delivery issues
We have had an Exchange 2003 mail server for a few years and have had great results without many big configuration changes, until now. Recently we added a new Qwest T-1 and changed our firewall to a Watchgaurd. After the change we have had a number of problems delivering mail to certain hosts. These hosts require that your mail server send mail with certain mail header requirements.
I am trying to get input on what’s required on all levels for mail delivery.
For outgoing mail to pass header requirements what should be in place at your DNS provider Ex: A record, your ISP Ex: Reverse DNS, your firewall and internal Windows DNS server, and your Exchange server?
Currently our mail server is sending an EHLO that won’t resolve. The format is internalhostDNSserver.internaldoamin.xxx.
Here is an example display of full headers received portion when I receive mail in my Yahoo account.
from 126.96.36.199 (EHLO appsrv10.mahowaldins.net) (188.8.131.52) by mta152.mail.re2.yahoo.com with SMTP; Wed, 28 Jan 2009 19:14:08 -0800
What should this be? If the internal mail server is called “exch” can you use mail.doamin.com then rely in internal DNS to do the rest?
How should this also correlate with your ISP reverse DNS, should they matchup some how?
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SPF or Sender Policy Framework will help your Exchange Server delivery mail smoothly.