I see the SOPW has a better answer already... but I'm posting this anyway in order to illustrate a process other than the
add print statements suggested above.
Inspection of Email::Sender::Simple shows sub header { starting at Ln 176:
sub header { # Ln 176
my ($self, $field) = @_;
my $headers = $self->{headers};
my $lc_field = lc $field;
# Ln 181
Based on what you've told us, one or both the variables that are supposed to be passed to the sub isn'/aren't getting there. Could that be something that will be supplied by main::id?
Alternately, I can only suggest that you track thru the module's source to find the call and backtrack from there to find why data isn't getting to $field
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