There are two things to suggest here. First, try specifying 'test' instead of 'smtp': my $mailer = new Mail::Mailer 'test'; This will echo the output to your screen instead of actually sending it. Second, here's a warning from perlform:

 The lone dot that ends a format can also prematurely end a
       mail message passing through a misconfigured Internet
       mailer (and based on experience, such misconfiguration is
       the rule, not the exception).  So when sending format code
       through mail, you should indent it so that the format-
       ending dot is not on the left margin; this will prevent
       SMTP cutoff.
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If 'test' works, you have a pretty good candidate for the second option.