[Linux-users] Sendmail upgrade

[Vu Pham]

On Wed, 2007-08-22 at 11:31 -0500, Stuart Biggerstaff wrote:
> In one of those "make a bunch of changes to a server then quit"
> situations, we have a server in our DMZ that is supposed to be sending
> mail to our regular mailserver inside the LAN, but isn't after an OS
> upgrade from an older RHEL to CentOS 5.0.  If I add my desktop's VLAN to
> Relay Domains, I can bounce mail from there to the mailserver with SMTP,
> but mail originating on the server itself isn't leaving.  I suspect we
> have run afoul a default restriction in a newer version of Sendmail or
> one that is a recent default instituted by Redhat.  We've been looking
> through documentation and searching the web, but so far nothing has
> helped--so I'm thinking we are missing something basic.
> 
> Anyone have a suggestion for the first or second things to look at?

If you manually telnet on the problem server to 127.0.0.1 via port 25
and send some test emails via smtp commands, do you see any error
message ?

Vu