To sum up, this program acts as a mail transport agent (MTA) carrying out two basic functions:
- Reception of the mail handed in by the mail user agent (MUA) (or email client).
- Handing the outbound mail to the corresponding mail transport agents
In what regards to compatibility, Sendmail supports a wide range of mail transport protocols: SMPT, HylaFax, DECnet's maill11, UUCP, ESMPT, QuickPage,...
An important consideration when it comes to using Sendmail is always to download the latest version and keeping it updated, because this will allow us to have the application with the latest security fixes.