I am not in any way an Internet guru or the like, but AFAIK, there are multiple Received lines most of the time, because your email is usually routed over more than one server. I wouldn't think that using a Perl module to send your emails could possibly cause this. Furthermore, have you searched CPAN yet for SMS? I remember getting a couple of matches when I tried a couple of months ago, although I haven't tried them.
Hope this helped.
CombatSquirrel.

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Entropy is the tendency of everything going to hell.