SMTP Issues sending out external mail

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Posted on by Wacar

We are currently in the process of moving to Business Central and are finding issues with sending email out to external clients getting the below message

SMTP returned error. 550 5.7.64 TenantAttribution; Relay Access Denied

We have other devices and servicedesks that use our connector without any issues sending to external emails

We use port 25 and the Anonymous and (ourdomain).mail.protection.outlook.com

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Nitin Verma 21,605 Moderator on at

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RE: SMTP Issues sending out external mail

Hi Wacar ,

please follow the below link, see if you can take any idea.

docs.microsoft.com/.../relay-access-denied-smtp

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