Error: access denied, bad outbound sender

Scenario:

A user is unable to send email and the error below is received:

smtp.eu1.exclaimer.net gave this error: Access denied, bad outbound sender AS(41000001)

Reason:

This error occurs because Office 365 has banned the user from sending email, because they are deemed to have sent excessive levels of outbound spam. 

Solution:

A user can be de-listed as per the guidance in this article.

Note: before requesting for a user to be de-listed, you should ensure that their account/computer has not been compromised, and that its not being used to send unsolicited email - otherwise the user could be banned again.

Handling a compromised account

To resolve a compromised user account:

Notifications

You can configure Office 365 to send notifications when outbound spam mail email is detected, or if a user has been banned by Office 365. To do this, update Outbound Spam Preference settings in the Exchange Online Admin Console, as per this article.

 

Haven't found a solution to your problem?

Please click the button below, login to the Exclaimer Cloud portal and raise a support ticket. A member of the Exclaimer Support team will then be in touch.

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