It dies with literally no error messages? Have you considered switching on debugging in Net::SMTP since you suspect it's related to this?

Net::SMTP->new( Host => 'mailhost',
                Hello => 'my.mail.domain',
                Timeout => 30,
                Debug   => 1, # <-- This
);

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In reply to Re: Mail - 32bit vs 64bit by marto
in thread Mail - 32bit vs 64bit by krausr

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