550 Authentication is required for relay


G

Guest

Where I work, we use Outlook for both internal and external email. When I
attempt to reply to an external email in Outlook 2003, it is returned to me
as Undeliverable, with the notation "550 Authentication is required for
relay". I am the only one to whom this is happenning.
 
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B

Brian Tillman

barabas7 said:
Where I work, we use Outlook for both internal and external email.
When I attempt to reply to an external email in Outlook 2003, it is
returned to me as Undeliverable, with the notation "550
Authentication is required for relay". I am the only one to whom
this is happenning.
Your SMTP server and ISP domains don't match. See if this helps:
http://support.microsoft.com/kb/290842/en-us
 

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