Thanks, Brent -- I tried this, but still no dice. I didn't copy all of your directives, since there's no relay involved in our case, but I did make sure that the following 3 were enabled... FEATURE(`allmasquerade')dnl FEATURE(`masquerade_entire_domain')dnl FEATURE(`masquerade_envelope')dnl If sendmail doesn't have any sort of rewriting capability of messages, is there something somewhere outside of sendmail that I can set to get the envelope-from and from: line to change? (Besides changing the hostname...) best, Jeff -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20070702/691ac517/attachment-0005.html>