mail delivery

[Constan]

Hello,

I have a webserver and a mail server which must have the same ip
address.
edited the zone file at soa.granitecanyon.com, my problem is that the
webserver domain name works fine. but when I sent a e-mail to my
domain.com. I got a message that the server could not deliver for 24
hours. my question is could
someone tell me what has to edited in the zone file. I tried to point
the webserver
and mailserver to the same ip address but that does not work..(ip
address already in use). when I sent a mail to my node number from my
isp with my account
before it it works fine. accountonmymachine at mydispnode
thanks in advance...


(this is my zone file)
localhost.com.   IN  A  127.0.0.1
www.domain.com.  IN A ip address
mail.domain.com.  IN CNAME www.domain.com. ;EXTREF