Wednesday , July 8 2020

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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About Satheshwaran Manoharan

Satheshwaran Manoharan is an Microsoft Office Server and Services MVP , Publisher of Azure365pro.com. Specialized in Office365 / Microsoft Exchange / Virtualization , Sathesh is an Messaging Expert supporting/Designing/Deploying many medium size businesses to large enterprises when it comes to Corporate messaging and Virtualization Infrastructure

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