550 mail via your ISPs

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

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