Error: 550: 5.7.1 Unable to Relay when sending out POP3 messages

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4 Responses

  1. Ivan says:

    Thanks Zubair – it worked like a charm.

  2. Marcos Pastor says:


    Thanks a lot!

  3. Bob says:

    Great steps. Worked like a charm. Many thanks.

  4. Jenny says:

    Exchange Error 550 can also be the result of Exchange database corruption. If this is the case, try to repair it using built-in utilities ESEUTIL and ISINTEG. If that does not help, try third party tools for Exchange server recovery.

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