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SMTP Error message in the outbound email setup.


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I'm getting the following message when testing my connection on the outbound email setup. Does anyone have any suggestions?

Error! Mailbox unavailable. The server response was: 5.7.1 Service unavailable, Client host [34.236.10.235] blocked using Spamhaus. To request removal from this list see https://www.spamhaus.org/query/ip/34.236.10.235 AS(1440) [DM6NAM10FT050.eop-nam10.prod.protection.outlook.com]

 

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