Posted by Justin Reynolds on August 13, 2009 at 06:12:42:
In Reply to: MS Exchange posted by Keith Smith on August 12, 2009 at 21:43:28:
If the Comcast connection you speak of is residential service, you can stop right there.
Most, if not all, IP address blocks that are assigned to residential class service (DSL, cable) are usually unable to send mail directly (blocked by ISP), or on so many DNS blocklists as to make it impossible to get the mail delivered (Google for "Spamhaus" or "Spamcop" for examples, but there are hundreds more).
Try this: go to "http://www.dnsbl.info/dnsbl-database-check.php" and let it check your home IP (or the one you intend to setup a mail server on). If anything comes back red, it means any mail originating from that IP will be flagged by that blocklist as spam.
Each file can be a maximum of 1MB in length Uploaded files will be purged from the server on a regular basis.