Subject: git-send-email.perl should check the version of Perl modules it uses

From: Koosha Khajehmoogahi <[email-masked]>
Date: Mon, 23 Mar 2015 02:11:04 +0100

On Debian Wheezy with its outdated packages, the version of Net::SMTP::SSL is 1.01. If you
try to use send-email, the script will crash with the following error:

STARTTLS failed! SSL connect attempt failed with unknown error error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed at /usr/libexec/git-core/git-send-email line 1294

Apparently, that is because the script is calling a subroutine (start_SSL()) that
is missing in older versions. I guess the script should check the minimum
required version before proceeding with the execution.