See KB article http://support.ipswitch.com/kb/IM-19991007-DM01.htm regarding how to change the Official Host Name of an existing domain. That will be FAR easier than trying to modify the templates. And don't forget to put "mail.abc.com" in the Host Alias field.
and don't forget in DNS forward zone for abc.com
abc.com MX 10 mail.abc.com
mail.abc.com MX 10 mail.abc.com
abc.com A iphere
mail.abc.com A ipthere
reverse zone:
ipthere.in-addr.arpa PTR mail.abc.com
Len
http://BIND8NT.MEIway.com: ISC BIND 8.2.2 p5 installable binary for NT4
http://IMGate.MEIway.com: Build free, hi-perf, anti-spam mail gateways
