About
Sendmail is:
- a mail transfer agent (MTA) for linux (ie a SMTP server, running on the port 25).
- a command line (MUA) to send a message
Reference
Almost all MTAs provide a sendmail interface making it the default implementation.
For instance, postfix postfix is a Sendmail-compatible MTA and therefore provides a sendmail command in its installation.
Management
Restart
/sbin/service sendmail restart
Installation
ubuntu
sudo apt-get install sendmail