Posts: 124
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Joined: Nov 2014
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9
2015-03-11, 07:03 AM
This problem is not related to MyBB.
This is problems of your webhost service provier.
Which mail handler you use? PHPmail or SMTP?
Also, check "Add message ID in mail headers" option in Board Settings. And enable full logging (Log everything) for email fucntion. Then see outgoing email logs.
English is not my native language, so, sorry for any mistakes which I will do for sure.
Posts: 894
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2015-03-11, 11:46 AM
A lot of email problems can be resolved by switching to SMTP and using a relay. The IP of your shared hosting server might be on a blacklist due to someone else's abuse.
RedHat Certified Systems Administrator