Thanks Ward, I actually forgot to expand my disk after I installed so I ran out of space. I'm now seeing the following errors in my mail.log file. I tried to install Webmin so I could test sendmail from there and I got the attached error.
Feb 26 08:40:04 incrediblepbx sm-msp-queue[18621]: x1PLZHxG011840: to=<
[email protected]>, delay=18:04:47, xdelay=00:00:00, mailer=relay, pri=5700106, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
Feb 26 08:42:41 incrediblepbx sendmail[18968]: gethostbyaddr(192.168.10.252) failed: 1
Feb 26 08:42:41 incrediblepbx sendmail[18968]: gethostbyaddr(192.168.3.231) failed: 1
Feb 26 08:42:41 incrediblepbx sendmail[18968]: NOQUEUE: SYSERR(root): No local mailer defined
Feb 26 08:42:41 incrediblepbx sendmail[18968]: NOQUEUE: SYSERR(root): QueueDirectory (Q) option must be set
Feb 26 08:45:32 incrediblepbx sendmail[19449]: gethostbyaddr(192.168.10.252) failed: 1
Feb 26 08:45:32 incrediblepbx sendmail[19449]: gethostbyaddr(192.168.3.231) failed: 1
Feb 26 08:45:32 incrediblepbx sendmail[19449]: NOQUEUE: SYSERR(root): No local mailer defined
Feb 26 08:45:32 incrediblepbx sendmail[19449]: NOQUEUE: SYSERR(root): QueueDirectory (Q) option must be set