> >> I'm on Comcast and am having no problems. I set the smarthost for > >> sendmail to "smtp.comcast.net" and, at least so far, have not triggered > >> anything that would block incoming or outgoing mail. All mail from me > >> goes through the "official" comcast mail server and does not appear to > >> come from a dynamic address. > > > > If you use smtp.comcast.net as outgoing I doubt you even need reverse > > DNS on your IP. Just be sure you update your SPF record to include > > smtp.comcast.net or something. Everyone has an SPF record, right? > > > > As a matter of fact, I'm trying to figure out what my SPF record should > be. It should be Comcast's, but they don't seem to have published one.
My best guess is to try this. "v=spf1 a:smtp.comcast.net ~all" But not sure. You need to look at all the mail coming out from your server flowing through smtp.comcast.net and see that its source is always one of the a record IP's for smtp.comcast.net. Matt
