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New Contributor raa
New Contributor

551 5.7.6 Message rejected as spam (CM)

There is one domain when I send message get this message. Can send to domain from gmail, tried white listing but that didn't work. 

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Esteemed Contributor
Esteemed Contributor

Re: 551 5.7.6 Message rejected as spam (CM)

Most likely the Optus mail server is being flagged for spam. Assuming it is the recipient that is bouncing this message and not Optus then there is little you can do. Restarting your equipment may select a different mail server IP however there is no guarantee the next mail server IP is not blocked as well.

 

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