exim4 software package provides metapackage to ease Exim MTA (v4) installation, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install exim4
exim4 is installed in your system.
Make ensure the exim4 package were installed using the commands given below,
$ sudo dpkg-query -l | grep exim4 *
You will get with exim4 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | |
| Package | exim4 |
| Version | 4.84.2-2+deb8u1 |
| Description | metapackage to ease Exim MTA (v4) installation |
| Sub Section |