Microsoft KB Archive/107089

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"An invalid Courier Mailbox" error message occurs in Microsoft Mail Gateway to SMTP

Article ID: 107089

Article Last Modified on 10/30/2006


  • Microsoft Mail Gateway to SMTP 2.1
  • Microsoft Mail Gateway to SMTP 3.0

This article was previously published under Q107089


Microsoft Mail Gateway to SMTP sometimes displays this message in the SMTPGATE.LOG file and/or the Gateway PC screen:

ERROR <mailbox name> is an invalid Courier Mailbox
[tx] 550 Addressee unknown


The <mailbox name> in the first error line may be invalid because it is longer than 10 characters or includes characters not allowed under MS Mail. These lines appear only if you have started the Gateway with these options:

  • cd -lacsy -gacsy or,

  • ci -lacsy -gacsy


Inform sender of the correct mailbox name.

Additional query words: 2.10 2.1 3.00 3.0 errmsg

Keywords: KB107089