-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 HI gang, In my town, I've noticed that other town employees with whom I send email are unable to send return email to me. This started happening about a month ago. My ISP is Comcast. This description was sent to me by a town employee: o In an attempt to limit the amount of SPAM on the Comcast Internet system, Comcast does not allow external email servers to send mail to Comcast email accounts where the sending email server's MX records do not match. o Because the TOWN mail server is behind our firewall our incoming mail IP address is different from our sending mail IP address. In other words our MX records do not match consequently Comcast blocks our mail from being sent to Comcast email addresses. Basic questions: - - What is an MX record? - - Is it normal for the mail server to be behind the firewall? I thought perhaps it would be either exposed to the net or on the DMZ. I am wondering if there is some misconfiguration or perhaps a different configuration that could be used to alleviate this problem. I have no expertise running a mail server and thought somebody on this list might be able to help. Thanks! Andy - -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA, USA http://www.wlug.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFETaM0Hl0iXDssISsRAqzYAKCIypfN3gf2xKOxc3QGaaeJdfvjxQCdHFTZ 2HNpPjjH/PvR9p2VdTcHzrA= =nnna -----END PGP SIGNATURE-----