10.6.8 IMAP - Clients can't receive email

I am running a IMAP mail server on Snow Leopard 10.6.8, which had been running fine for 1+ year.. It is located at my residence. Long story short, after a power outage/cable outage Comcast just decided to block port 25 on my residence which made me have to switch my SMTP port to 587. After much muddling around, I got that to go, but now clients can't recieve emails. I have turned on debug logging on the mail server, but I can't see anything to explain it. Eventually, the messages are kicked back to the sender (as a test, I sent from my mobile me account) with the following
Thu, 07 Mar 2013 22:55:56 +000 (GMT) TCP active open: No addresses found for host Error: Connection timed out.
However, I can't see any activtiy in the server side logs. DNS possibly?
Any help is GREATLY appreciated.

Here are the logs from the IMAP (last group of timestamps). Are there any other logs that would be useful?
IMAP
Mar  8 10:56:27 server dovecot[38993]: IMAP(*): Master disconnected (pid 39117)
Mar  8 10:56:27 server dovecot[38993]: IMAP(*): Master disconnected (pid 39070)
Mar  8 10:58:51 server dovecot[39343]: imap-login: Login: user=<dean>, method=PLAIN, rip=76.21.19.69, lip=192.168.1.210, TLS
Mar  8 10:58:51 server dovecot[39343]: IMAP(*): maildir: data=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC
Mar  8 10:58:51 server dovecot[39343]: IMAP(*): maildir++: root=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC, index=, control=, inbox=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC
Mar  8 10:58:51 server dovecot[39343]: imap-login: Login: user=<dean>, method=PLAIN, rip=76.21.19.69, lip=192.168.1.210, TLS
Mar  8 10:58:51 server dovecot[39343]: IMAP(*): maildir: data=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC
Mar  8 10:58:51 server dovecot[39343]: IMAP(*): maildir++: root=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC, index=, control=, inbox=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC
Mar  8 11:00:51 server dovecot[39343]: imap-login: Login: user=<dean>, method=PLAIN, rip=76.21.19.69, lip=192.168.1.210, TLS
Mar  8 11:00:51 server dovecot[39343]: IMAP(*): maildir: data=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC
Mar  8 11:00:51 server dovecot[39343]: IMAP(*): maildir++: root=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC, index=, control=, inbox=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC
Mar  8 11:02:28 server dovecot[39343]: imap-login: Login: user=<dean>, method=CRAM-MD5, rip=192.168.1.210, lip=192.168.1.210, TLS
Mar  8 11:02:28 server dovecot[39343]: IMAP(*): maildir: data=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC
Mar  8 11:02:28 server dovecot[39343]: IMAP(*): maildir++: root=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC, index=, control=, inbox=/Volumes/External HD3/spool/imap/dovecot/mail/F037805C-94D5-47B8-8D48-DC15F14905AC

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