esmtp software package provides user configurable relay-only MTA, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install esmtp
esmtp is installed in your system.
Make ensure the esmtp package were installed using the commands given below,
$ sudo dpkg-query -l | grep esmtp *
You will get with esmtp package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | |
| Package | esmtp |
| Version | 1.2-14 |
| Description | user configurable relay-only MTA |
| Sub Section |
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