git send-email does not work due to missing Perl module IO::Socket::SSL

Issue: `git send-email` does not work due to missing Perl module IO::Socket::SSL

Environment (conda list):

```
$ conda list
# packages in environment at $HOME/Logiciels/miniconda3/envs/git2.23:
#
# Name Version Build Channel
ca-certificates 2019.9.11 hecc5488_0 conda-forge
curl 7.65.3 h22ea746_0 conda-forge
expat 2.2.5 h6de7cb9_1003 conda-forge
gettext 0.19.8.1 h46ab8bc_1002 conda-forge
git 2.23.0 pl526hbdf3604_2 conda-forge
krb5 1.16.3 hcfa6398_1001 conda-forge
libcurl 7.65.3 h16faf7d_0 conda-forge
libcxx 9.0.0 0 conda-forge
libcxxabi 9.0.0 0 conda-forge
libedit 3.1.20170329 hcfe32e1_1001 conda-forge
libffi 3.2.1 h6de7cb9_1006 conda-forge
libiconv 1.15 h01d97ff_1005 conda-forge
libssh2 1.8.2 hcdc9a53_2 conda-forge
ncurses 6.1 h0a44026_1002 conda-forge
openssl 1.1.1c h01d97ff_0 conda-forge
pcre 8.41 h0a44026_1003 conda-forge
perl 5.26.2 haec8ef5_1006 conda-forge
tk 8.6.9 h2573ce8_1003 conda-forge
zlib 1.2.11 h01d97ff_1006 conda-forge
```

Details about conda and system ( conda info ):

```
$ conda info

active environment : git2.23
active env location : $HOME/Logiciels/miniconda3/envs/git2.23
shell level : 1
user config file : $HOME/.condarc
populated config files : $HOME/.condarc
conda version : 4.7.10
conda-build version : 3.18.9
python version : 3.7.3.final.0
virtual packages :
base environment : $HOME/Logiciels/miniconda3 (writable)
channel URLs : https://conda.anaconda.org/conda-forge/osx-64
https://conda.anaconda.org/conda-forge/noarch
https://repo.anaconda.com/pkgs/main/osx-64
https://repo.anaconda.com/pkgs/main/noarch
https://repo.anaconda.com/pkgs/r/osx-64
https://repo.anaconda.com/pkgs/r/noarch
package cache : $HOME/Logiciels/miniconda3/pkgs
$HOME/.conda/pkgs
envs directories : $HOME/Logiciels/miniconda3/envs
$HOME/.conda/envs
platform : osx-64
user-agent : conda/4.7.10 requests/2.22.0 CPython/3.7.3 Darwin/15.6.0 OSX/10.11.6
UID:GID : 502:20
netrc file : None
offline mode : False
```

I tried `git send-email` for the first time today and it failed with:
~~~bash
$ git send-email ....
....
Not using SSL_VERIFY_PEER due to out-of-date IO::Socket::SSL.
To use SSL please install IO::Socket::SSL with version>=2.007 at $HOME/Logiciels/miniconda3/envs/git/lib/5.26.2/Net/SMTP.pm line 270

$ perl -e "use IO::Socket::SSL;"
Can't locate IO/Socket/SSL.pm in @INC (you may need to install the IO::Socket::SSL module)
(@INC contains:
$HOME/Logiciels/miniconda3/envs/git2.23/lib/site_perl/5.26.2/darwin-thread-multi-2level
$HOME/Logiciels/miniconda3/envs/git2.23/lib/site_perl/5.26.2
$HOME/Logiciels/miniconda3/envs/git2.23/lib/5.26.2/darwin-thread-multi-2level
$HOME/Logiciels/miniconda3/envs/git2.23/lib/5.26.2 .) at -e line 1.
BEGIN failed--compilation aborted at -e line 1.
~~~