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Thursday, August 18, 2022
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535 Authentication Credentials invalid on Outgoing mails

Suddenly Outgoing mails stopped. with below error

Error : Exchange Toolbox – queue Viewer

4.4.0 Primary Target IP Address Responded with: “535 Authentication Credentials invalid.” Attempted to failover to alternate host, but that did not succeed. Either There are no Alternate hosts, or delivery failed to all alternative hosts.

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Solution –  Smart Host Authentication  – Credentials were invalid

In Send Connector Properties . Smart host authentication password was changed. Had to Update the new password.

Without any service restart mail flow started flowing.

Optional – Restart Transport service to refresh.

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Satheshwaran Manoharan
Satheshwaran Manoharanhttps://www.azure365pro.com
Specialized in Microsoft Azure - Office 365 / Microsoft Exchange; conducted numerous projects worldwide in designing, supporting, and implementing messaging and virtualization infrastructure for medium-sized and large enterprises. Further, I am a Cloud Architect and Technical Advisor for various start-ups.

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