Net::SMTP does neither supports SSL nor IPv6.

git-send-mail does not use Net::SMTP directly for SSL support, but:
- for direct connections (port 465) it uses Net::SMTP::SSL which just
  replaces the superclass if Net::SMTP with IO::Socket::SSL and thus
  implicitly supports IPv6 (because IO::Socket::SSL does)
- for plain connections with SSL upgrade git-send-mail uses Net::SMTP for
  the initial connect and then does Net::SMTP::SSL->start_SSL (e.g.
  inherited from IO::Socket::SSL) to upgrade the socket to SSL.

The problem here is that Net::SMTP does not support IPv6, but this
should be solvable by using Net::INETGlue::INET_is_INET6 before loading

But all these tricks are just workarounds for missing IPv6 and SSL support
directly in the Net::SMTP, Net::FTP and Net::POP3.
I therefore repeat my proposal from RT#93823 (no response yet) to add
transparent support for IPv6 and SSL into these modules. By transparent I
mean that the features are available if the necessary modules are installed
(e.g. IO::Socket::SSL for SSL and IO::Socket::INET6 or IO::Socket::IP for
IPv6), but that it works like before if they are not installed.

I don't have these patches yet, but most of the necessary code is already
there in Net::SSLGlue and Net::INET6Glue.
Would you accept and incorporate such patches?


On Thu, May 01, 2014 at 11:05:46AM -0700, Jonathan Nieder <jrnie...@gmail.com> 
> Hi,
> Matthias-Christian Ott wrote[1]:
> > git send-email uses Net::SMTP connections that use STARTTLS. Net::SMTP
> > does not support IPv6. I patched Net:SMTP to use IO::Socket::INET6 and
> > it worked.
> Thanks for reporting.
>  1. What version of Net::SMTP do you use?
>  2. Would you be willing to contribute your patch to Net::SMTP upstream,
>     for example by mailing it to bug-lib...@rt.cpan.org with
>     the string "[rt.cpan.org #93823]" somewhere in the subject line[2]?
> Hope that helps,
> Jonathan
> [1] http://thread.gmane.org/gmane.comp.version-control.git/247769
> [2] https://rt.cpan.org/Public/Bug/Display.html?id=93823
> https://rt.cpan.org/NoAuth/RT/CPAN/Usage.html

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