SMTP 550 Verification failed in Exchange 2003

stephenyu · Joined: 30 Jan 2008 Posts: 1

I have Windows Small Business 2003 Server. I can receive e-mail. When I sent
out e-mail, I cgot SMTP 550 Verification failed. Someone use my SMTP relay to
send out a lot spam e-mail. How can I fix this problem?

Archived from group: microsoft>public>exchange>connectivity

Leif Pedersen [ MVP] · Joined: 05 Aug 2007 Posts: 232

Hi,

These 2 things does not necessarily have anything to do with each other.

Exchange 200xx server is not by default an open relay so you must have
echanged something - see
http://www.msexchange.org/tutorials/MF005.html

How to you send external mails (using DNS or smart-host)?
Sounds to me like you are using a smart-host amd taht this smart-host
require you to authenticate before sending.

Leif

"stephenyu" skrev i meddelelsen @microsoft.com...
>I have Windows Small Business 2003 Server. I can receive e-mail. When I
>sent
> out e-mail, I cgot SMTP 550 Verification failed. Someone use my SMTP relay
> to
> send out a lot spam e-mail. How can I fix this problem?

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