I just got a mysterious error message (ok, it's one that I haven't seen
before and may not be mysterious to anyone else).  My list is set up with a
confirm and I have a member that has been on the list for a couple of weeks
and I just got a couple of error messages today that said the following:
>--> Error description:
>Error-For:  XX@XX
>Error-Code: 3
>Error-Text: User unknown: Not a typewriter
>
>Error-End:  One error reported.
>
>
>   ----- Transcript of session follows -----
>550 <XX@XX>... User unknown: Not a typewriter

Anyone know what this particular error message means?
I'm curious (and somewhat amused).
Thanks,
Tea