Re: No NDR for unknown user

"Sanford Whiteman" <swhitemanlistens-software@xxxxxxxxxxxxxxxxxxxxx> wrote
in message news:op.tuw8hbw26c17zw@xxxxxxxxxxxxxxxxxxxxxxx
On that note, it is advisable for several reasons to manage
submissions separately from deliveries.

For one, many ISPs do not allow users to submit mail to 3rd-party
servers on port 25, because these submissions look largely the same as
(spam) deliveries. They will allow connections to the standard
submission port 587. Yes, you could bind :25 and :587 on the same
virtual server in IIS, but splitting them across two different
virtuals is just as easy.

Second, having separate queues for different types of mail helps you
distinguish traffic by origin and have different queue retry cycles
for each. For example, if you are gatewaying for a variety of remote
mailbox servers, you may want to guarantee store-and-forward for 24
hours to those domains, while for other remote domains, you can set a
15 minute/4 hours retry cycle.

Third, you can enforce SSL encryption (SMPTS) on your submission
server without affecting the MX, which must by allow unencrypted
sessions. This gives you a good-faith way of offering secure channels
to all of your mobile users.

OK, I implemented a submission server on port 587 per your suggestion.
Everything seems to be fine except for one small problem: I am unable to
send to other users on my own domain. I checked and the message I sent is
sitting in the Drop folder. Did I err by using the same domain name for the
submission virtual server? What domain name should I use for it, or indeed
does it matter? Could I use a subdomain like submit.mydomain.com?


.

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