I saw that you already had received appropriate answers to your mail,
but just in case you want to continue to send most mail directly and
only send mail via comcast's smtp servers if the mail is going to
people who block "dialup" ip blocks, here's how I do it:
in main.cf, put something like this:
] transport_maps = hash:/usr/local/etc/postfix/transport
in tranport, put something like this:
] aol.com smtp:smtp.comcast.net
] mury.k12.ut.us smtp:smtp.comcast.net
(and add any other domains who reject your mail because they don't like
your IP), then run this:
$ postmap transport
$ postfix reload
and most of your mail will continue to be directly delivered, but mail
to the domains listed in transport (aol.com and mury.k12.ut.us in my
example above) will be routed to smtp.comcast.net, who will forward
them on for you.
And no, comcast definitely doesn't require smtp auth.
-jan-
--
Jan L. Peterson
Peterson Technologies
<[EMAIL PROTECTED]>
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