I have tried to install Net::SSLeay though cpan to install Email::Send::SMTP::TLS but I am getting the following error.
cpan[5]> install Net::SSLeay
Running i         
        Try to install both dependencies listed below. It should solve the issue that you have.
sudo apt-get install libnet-ssleay-perl
sudo apt-get install libio-socket-ssl-perl
                                                                        On ubuntu, try
sudo apt-get install libnet-ssleay-perl
sudo apt-get install libcrypt-ssleay-perl
                                                                        On Centos, here's my solution:
sudo yum install perl perl-CPAN perl-Net-SSLeay perl-IO-Socket-SSL
                                                                        Try running through the process on your own manually. From the CPAN prompt:
look Net::SSLeay to go into a shell in the unpacked directoryperl Makefile.PLmakemake testmake installIf there is a "README" or "INSTALL" file, try reading those too. If you come across any errors, you can append your question and maybe someone can help.
Centos 6.5:
yum install perl-Net-SSLeay
                                                                        On Arch Linux: pacman -S perl-net-ssleay