On 01 Dec 2003, at 07:16, Paul Didzerekis wrote:
It seems that Verizon has setup a new system where they require that all incoming messages to their servers be authenticated by the sending SMTP server with User Authentication. This means that the Verizon servers send back a response when SIMS tries to send a message and that response requires that SIMS verify that the sender of the message is an authorized user on the SIMS server. Since SIMS does not support this all of our email sent to anyone on Verizon's email servers gets rejected.
Who _does_ support this? Sounds dangerous to me. Or are they simply trying to send a test message to the recipeint?
for example, if fred has an email address [EMAIL PROTECTED] and another [EMAIL PROTECTED] and sends mail using his lamer.tld id through mymachine.tld to someone at verizon, verizon might be trying to send a mail to [EMAIL PROTECTED] via your server. if this is rejected (as it should be), then they could be droppign the mail.
This is asinine if it's what they are doing, but it's the only way I can think of to "authenticate" an email address without some wiggyness on both sides.
Note, however, that this sort of check _IS_ something that my own server does for hotmail, yahoo, mac.com, and other free email services, simply because of the preponderance of spoofed return addresses. If the aforementioned Fred had a hotmail account and sent mail to me as [EMAIL PROTECTED] and it came from your server, my server would reject it.
-- In other news, Gandalf died. -- Secret Diary of Boromir
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