Oct 10 15:57:08 help sendmail[21987]: m9AKuccj019848: to="|/etc/smrsh/rt-mailgate --queue general --action correspond --url http://help.domain.com/", ctladdr= (8/0), delay=00:00:12, xdelay=00:00:01, mailer=prog, pri=30485, dsn=4.0.0, stat=Deferred: prog mailer (/usr/sbin/smrsh) exited with EX_TEMPFAIL

After installation and initial configuration, I tried to submit my first test tickets into RT and encountered the error above. Reading that error, it seems pretty bad. In reality, it was a really dumb mistake. I changed the queue name and did not properly update the /etc/aliases file. Phew, easy fix!