Your SMTP server seems to be demanding that the SENDER be identified as a part of it's domain.

Use the syntax:

 # For plain SMTP, use:
 #     $msg->send("my.name@my.domain.com"); 
 #
 #For Mime::LITE, use this syntax to create the object:

    my $msg = MIME::Lite->new(
           From     =>'my.name@myhost.com',
         ....
[download]

Also, TCPDUMP may be overkill, especially if you are not familiar with it. Try DEBUG:

MIME::Lite->send('smtp','some.host',Debug=>1);
[download]

.. But I don't think that will help you. Your SMTP server has already told you what it does not like about your message.

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