The maillog on our CentOS 5.3 installation indicates some application is trying to send email to my normal office email address but relaying through an old host. I've searched sendmail conf files, Apache conf files, and many others (Bugzilla params, Subversion conf, just as examples) and for the life of me I can't find the reference. (The main error refers to a panic, but that's another question.) I've tried grep beginning at / recursively looking for the character string that is the name of the old mail server. No references are found but then grep just stops giving results and never comes back to the shell prompt. (I've let it run for like 20 minutes!)

Any ideas where I might also look?

Oh, and yes, aliases has the correct entry for the correct mailhost.