[CentOS] Centos Account Email Issue

Thu Dec 27 19:43:41 UTC 2012
Robert Moskowitz <rgm at htt-consult.com>

On 12/27/2012 02:08 PM, Scott Adams wrote:
> Hello,
> I am having an issue with email on all IP-based
> site/accounts that I set up on  CENTOS 6.3 x86_64
> standard – WHM 11.34.1 (build 5). On the server's
> main IP address domain account/site, both sending
> and receiving email works just fine, however, on
> all IP-based accounts/sites I create the email
> users can send email but not receive it, and dnsstuff.com shows:
> All connections to Mailservers port 25 have
> failed. The standard port for SMTP transactions
> is 25, so your servers should be operating on
> that port. It is recommended that it be fixed in
> order for your mail service to operate properly.
> The Mail Servers that failed are:
> | failed message send with:
> messaging failure: Time out occurred or Remote
> server closed connection prematurely
> I have tried multiple solutions but haven't been
> able to get email working properly. Any ideas would be appreciated.

The default firewall rules do not allow connection to port 25. Have you 
enabled smtp for your local firewall?

(I hit this one myself!)