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Monday, June 17, 2024

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
Award-winning Technology Leader with a wealth of experience running large teams and diversified industry exposure in cloud computing. From shipping lines to rolling stocks.In-depth expertise in driving cloud adoption strategies and modernizing systems to cloud native. Specialized in Microsoft Cloud, DevOps, and Microsoft 365 Stack and conducted numerous successful projects worldwide. Also, Acting as a Technical Advisor for various start-ups.

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