Here's the situation.
Our client has a box running a web server, and another behind it which runs the Vignette system, both on Solaris.
The box running Vignette is behind a firewall and uses an internal IP address.
This server sends out mailing lists regularly, but there's a problem all of a sudden.
Its host.domain is something like apps.abcdef.com. When Vignette uses the www server's sendmail as the gateway, the mails get sent out as email@example.com instead of firstname.lastname@example.org.
Another site which resides on the same box, efgh.com, sends out mails using the same gateway but does not face the same problem.
Anyone has an inkling of why this might be happening?