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by doctorhumvee

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My Client is running MSExchange5.5 w/ NT4.0 Server. REcently I discovered literally 1000's of messages back to the Administrative email account showing an "outbound mail failure". All of the messages are of the same type but the "TO:" and "FROM:" are all different. Please also note that no one in the office is any of the "FROM:" people nor does anyone know any of the "TO:" people. I have all the normal securities in place ie. Cisco firewall, Symantec enterprise Virus protection, current virus definitions. I delete these now on a daily basis, but they continue to happen. I have included a copy of one of the notices. Any ideas on what it may be, remember the "failed mail" is inside going out.

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----Original Message-----
From: Administrator
Sent: Friday, April 12, 2002 11:51 AM
To: Administrator
Subject: Notification: Outbound Mail Failure - The host was not found.

A mail message could not be sent because the following hostis unknown:

jointedly.com
The message that caused this notification was:

To: ; ; ;
; ; ; ;
From:
Subject:

6 replies

by bear_nospam

It seems a spammer uses your mail server as a relay. Disable smtp-relaying on your server.

Greets
Thomas

by noufal

It is known as spam mailing .youn should deseble mail relay.go to routing restriction and do it.

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