A & MX records point to different places:
ServerA A record points to the XXX.XXX.XXX.122 IP
ServerA MX record points to ServerA (10 serverA.com)
ServerB A record points to the XXX.XXX.XXX.124 IP
ServerB MX record points to ServerB (10 serverB.com)
I'll try adding each other to their respective hosts file.
UPDATE: Changing hosts didn't seem to make a difference.
UPDATED UPDATE: Changing hosts, rebooting on both machines made the difference. We're good now!
Last edited by 3DPeruna; 21st March 2012 at 15:56.
Reason: Updated Update