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From: Chris Davies <chris-use...@roaima.co.uk>
Newsgroups: comp.mail.misc
Subject: Re: SMTP error: Invalid address
Date: Wed, 12 Sep 2012 09:10:37 +0100
Organization: Roaima. Harrogate, North Yorkshire, UK
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Message-ID: <tks5i9xu3q.ln2@news.roaima.co.uk>
References: <20259592-5f66-4da9-b734-eec690859bb9@googlegroups.com> <eli$1209111528@qz.little-neck.ny.us>
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Eli the Bearded <*...@eli.users.panix.com> wrote:
>        There is something wrong with the destination; I checked
>        mydomain.com and it seems to have a valid SMTP listener,
>        but you probably lied about the email address.

Valid listener, but no such address (also assuming that the address
given by the OP is actually correct):

    $ host -t mx mydomain.com 
    mydomain.com mail is handled by 0 mx.mailix.net.

    $ host mx.mailix.net
    mx.mailix.net has address 66.11.225.84
    Host mx.mailix.net not found: 3(NXDOMAIN)
    Host mx.mailix.net not found: 3(NXDOMAIN)

    $ nc -vvv 66.11.225.84 smtp
    Connection to 66.11.225.84 25 port [tcp/smtp] succeeded!
    220 mx.mailix.net ESMTP Exim 4.71 Wed, 12 Sep 2012 01:02:24 -0700
    HELO boo
    250 mx.mailix.net Hello boo [{your_ip_address}]
    MAIL FROM:<>
    250 OK
    RCPT TO:<myn...@mydomain.com>
    550 unrouteable address
    QUIT
    221 mx.mailix.net closing connection

Chris