you should check that the mailer object exists. for example:

$mailer= Mail::Mailer->new(...)
  or die qq{$0: Can't create mailer object: $!};
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you can further inspect the $mailer object with Data::Dumper

use Data::Dumper; $Data::Dumper::Indent= 1;
print Dumper $mailer;
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~Particle *accelerates*