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If a CiviCRM site is using MS Exchange to handle email, a user attempting to unsubscribe gets an error like:

Mailing Error Failed to send data [SMTP: Invalid response code received from SMTP server while sending email. This is often caused by a misconfiguration in Outbound Email settings. Please verify the settings at Administer CiviCRM >> Global Settings >> Outbound Email (SMTP). (code: 554, response: 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied; Failed to process message due to a permanent exception with message Cannot submit message. 0.35250:89230000,

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I discovered this was because CiviCRM attempts to send the email from do-not-reply@ and the account used to send the email did not have the rights to send on behalf of that email address. You cure it by creating a shared mailbox called do-no-reply@ and give the outbound email account rights to send email from that mailbox.

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