Hello,
Ever since we moved our business to another building down the road, and
switched ISP's (with a new block of IP's), our Exchange Server has been
acting up.
We didn't have to change hardly anything after moving - except some IP
addresses on the ISA Firewall Server's external interface, and some DNS
settings on the Exchange Server (for outgoing mail DNS resolution).
>From time to time, external users that are sending e-mail to users on
the Exchange Box, are getting "Unknown User" error messages. This has
NEVER happened before - and am desperately trying to figure out, how
changing ISP's, can cause all these problems. How the heck could a
remote system, get as far as opening a connection all the way to the
Exchange Box, and once authenticated etc., it's unable to find a
particular user on the system - when they are there plain as day???
This server has never hiccupped a single time before the move -
Also, (here is another good one), on AOL and similar systems, from time
to time, users that had no problem before the move, could send mail to
particular users with no problems, are NOW they are getting similar
error messages:
> The following recipient(s) could not be reached:
> [EMAIL PROTECTED] on 5/28/2003 4:37 PM
> The e-mail account does not exist at the organization this
> message was sent to. Check the e-mail address, or contact the
> recipient directly to find out the correct address.
> < rly-xg03.mx.aol.com #5.1.1 SMTP; 550 geomarxxx IS NOT
ACCEPTING MAIL FROM THIS SENDER >
Does anybody have ANY ideas as to what is going on here?
Our client is really getting irritated - and I have been working day and
night, making sure DNS is setup right, our Reverse DNS is setup right
(with our new IP's), just anything else that I thought of...
Thanks in advance for any information offered,
Mike
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