550 mail via your ISPs

K

Kim Joy

All of my users receive this message when sending email to anyone at the
@wlv.ac.uk domain - HELP!
 
B

Brian Tillman

Kim Joy said:
All of my users receive this message when sending email to anyone at
the @wlv.ac.uk domain - HELP!

Exactly what message and with what version of Outlook?
 
B

Brian Tillman

Kim Joy said:
"could not be delivered to some or all of the intended recipients.
User<[email protected]> - (550 mail via your ISPs)

Either failure to authenticate to the outgoing server or your IP address or
domain has been blackholed.
 
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