We make extensive use of Mail::Sender in our codebase. Recently I've noticed that I can't always run the Perl debugger over such code; I've started to get messages like this:

Can't call method "opened" without a package or object reference at (e
+val 137)[/usr/local/lib/perl5/site_perl/5.8.3/Mail/Sender.pm:312] lin
+e 46, <GEN3> line 1.
        Mail::Sender::DBIO::opened('Mail::Sender::DBIO=GLOB(0x99fca48)
+') called at /usr/local/lib/perl5/site_perl/5.8.3/Mail/Sender.pm line
+ 160
        Mail::Sender::send_cmd('Mail::Sender::DBIO=GLOB(0x99fca48)','e
+hlo xifos.nexcerpt.com') called at /usr/local/lib/perl5/site_perl/5.8
+.3/Mail/Sender.pm line 180
        Mail::Sender::say_helo('Nexcerpt::Mailer=HASH(0x996f3d0)','Mai
+l::Sender::DBIO=GLOB(0x99fca48)') called at /usr/local/lib/perl5/site
+_perl/5.8.3/Mail/Sender.pm line 922
        Mail::Sender::Connect('Nexcerpt::Mailer=HASH(0x996f3d0)') call
+ed at /usr/local/lib/perl5/site_perl/5.8.3/Mail/Sender.pm line 1326
        Mail::Sender::OpenMultipart('Nexcerpt::Mailer=HASH(0x996f3d0)'
+,'HASH(0x993c4a0)') called at /home/nexcerpt/Nexcerpt/Mailer.pm line 
+434
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And yep, I know that "Nexcerpt::Mailer" isn't the same as a "Mail::Sender" object; we subclass it here.

Edit by castaway: swapped pre tags for code tags