in reply to problematic OO
I'm not OO Perl guru but in constructor (new sub) You declared $self as hashref but seems to me that You never initialize referred hash. All items like $self->{SUBJECT} or $self->{SUBJECT} are always undefined because You never assign something to them.
Then when calling You should do
Then when calling You should do
PL::Mail->new();
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Seekers of Perl Wisdom