SendEmail

Requirements (for TLS)

Debian/Ubuntu

sudo apt update
sudo apt install libnet-ssleay-perl libio-socket-ssl-perl

CentOS/RHEL/Fedora

sudo dnf install perl-Net-SSLeay perl-IO-Socket-SSL

If it is an old version of CentOS:

sudo yum install perl-Net-SSLeay perl-IO-Socket-SSL

Sending e-mail

./sendEmail.pl \
  -f noreply@example.com \
  -u user \
  -m message \
  -t destination@example.com \
  -s your-mail-server.example.com \
  -o tls=yes \
  -xu smtp-user \
  -xp smtp-pass