in reply to Undefined value error
I suspect the call to new returns an undefined value because it fails. The Net::SMTP docs state:
On failure undef will be returned and $@ will contain the reason for the failure.
You can try to get more information by showing $@:
$smtp = Net::SMTP->new("$servername", Debug => 1); print "$@\n";
Is $servername a valid remote host?
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