| Rank | MTA | Description |
| 1 | Postfix |
- From CentOS 6.x, Postfix has become default MTA.
- Postfix is secure, easy to use and has good community to support it.
- Good for beginners.
|
| 1 | Exim |
- Exim is secure and has good docs.
- Exim enjoy rank 1 as its has Windows support through Cygwin distro.
- Good for beginners.
|
| 2 | qmail |
- qmail is secure but very old and patchy.
- Suitable for intermediate linux sysadmin
|
| 3 | sendmail |
- sendmail is grandfather of all MTA.
- It has default MTA in all distro for many decades.
- Sendmail is many security concerns.
|