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deklinmFlag for United States of America

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Sending Email Error 550

I am trying to email a customer who's email address resides on  Each time I send them an email it bounces back with the following information:

550 5.7.1 SPF unauthorized mail is prohibited. (in reply to DATA command)

Action: failed
Status: 5.7.1
Remote-MTA: dns;
Diagnostic-Code: smtp; 550 5.7.1 SPF unauthorized mail is prohibited.

How do I fix this?
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Alan Hardisty
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Sometimes our ip is blacklisted by the receiver server by founding any unusual content .
 We don't have any idea about that content and our ip trust level is decreased

So mail them to add your ip to their whitelist or remove from blacklist.

The clue is in the rejection, namely "SPF unauthorized mail is prohibited" - your SPF record prohibits your server from sending.

A correctly published SPF record - or the removal of the SPF record should solve the problem.

Suggesting that they whitelist you is not the correct way to solve the problem.
ya you may be right but mostly blacklisting is the reason for the bouncing back your mail ans rejected by the receiver end
"mostly blacklisting is the reason for the bouncing back your mail" - That may be true, but in this instance, it isn't.

Servers reject email for a multitude of reasons, but the specific reason is actually stated in the rejection message as posted by Deklinm and that reason is because of an Invalid SPF record.

If the reason was due to being listed on a blacklist, then the error message would not specifically state SPF as the reason.