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554 unknown user - unsolicited 1x

  • 1.  554 unknown user - unsolicited 1x

    Posted Feb 16, 2016 04:38 PM

    Hi,

    We're having issue sending (replying) email to one domain as delivery keeps failing and SMG records this error: 554 unknown user - unsolicited 1x.

    I don't see my domain on any blacklist. I think it has something to do with the users end but I want to doublecheck.

    Please let me know.

    SMG version is 10.5.1-2

    Thanks.