How to fix problems with the Mailbox unavailable. The server response was: 5.7.1 Message rejected as spam by Content Filtering error How to fix problems with the Mailbox unavailable. The server response was: 5.7.1 Message rejected as spam by Content Filtering error

How to fix problems the Mailbox unavailable. The server response was: 5.7.1 Message rejected as spam by Content Filtering error

The Problem:

You are trying to send an email in C# from your website (using Exchange as the email server), but you get the error message

Mailbox unavailable. The server response was: 5.7.1 Message rejected as spam by Content Filtering.

whenever you send the email.  It is clearly not spam.

The Cause:

You are triggering a spam filter based on the number of words and characthers in the sample email you’re sending.

The Solution:

You should increase the number of words in the body of your email by five or more.  It’s strange, but it works.

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Written By Steve French

 

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