At 18:37 2005-02-03 -0500, Robert Arnold wrote:
> Access from external networks to the SMTP-server is blocked by most
> ISPs. There is no real need to open it up for smtps.
SPF requires it. If you're away from your "home" internet connection and
connected via some other network, and you want to send email using your
"usual" address, you're going to need to use your ISP's mailserver,
otherwise you'll fail an SPF check on the recipient's end.
SPF is already broken for users who cannot relay via their own mailserver
(say, connected via Earflink but they have a domain hosted
elsewhere). Plus, both SPF and Domainkeys present specific problems for
listserves and mail forwarding services, which must change how they do
things or risk generating bounced mail from delivery endpoints.
Sean B. Straw / Professional Software Engineering
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