On Tue, Oct 25, 2011 at 10:57, Dennis Burgess <dmburgess@linktechs.net>wrote:
[dmb] This is the exact question, why, do you NEED a SMTP Relay on ANY network. Your domain has a mail server out on the net that if you authenticate to, I am sure will relay your mail, and the reverse DNS and SPF records would match then as well. Why does the local internet provide NEED to relay though their server, regardless of the port.
Not every domain actually has a mail server that allows remote authentication/relay. People hosting small vanity domains with cheap hosting providers might not. Maybe people using small ISPs with less-than-top-notch staff. Heck, maybe there's just a short-term issue with the mail server, and you still want/need to send something out right now, so you use your ISP's mail system. David Smith MVN.net