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Outlook 360 sent mail rejected

Bill Paine

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Hello,  a couple of our users are having their emails rejected to a few of our clients.  I don't really believe that ESET is messing with our emails as they depart, but I'm hoping that someone has a solution.

Many of the rejection emails include something like this:



Subject: [SPAM] Mail System Error - Returned Mail with Subject: 327128


This Message was undeliverable due to the following reason:


Your message was not delivered because the destination computer refused to accept it (the error message is reproduced below).  This type of error is usually due to a mis-configured account or mail delivery system on the destination computer; however, it could be caused by your message since some mail systems refuse messages with invalid header information, or if they are too large.


Your message was rejected by gmail-smtp-in.l.google.com for the following reason:


     5.7.1 [] Our system has detected that this message is not RFC

     5.7.1 5322 compliant: duplicate headers. To reduce the amount of spam sent

     5.7.1 to Gmail, this message has been blocked. Please review

     5.7.1  RFC 5322 specifications for more information. y5-20020a814b05000000b00354927dfb3fsi16628844ywa.50 - gsmtp The following attachments have been removed from the bounce message: 327128 MARTINEZ REVISED 2.jpg


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The email is not recognized as spam by ESET Antispam. It appears that the misdetection has been resolved in the mean time.

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