[Postfix](http://www.postfix.org/) is a popular open-source [Mail Transfer Agent](https://en.wikipedia.org/wiki/Message_transfer_agent) (MTA) that can be used to route and deliver email on a Linux system. If you manage a cloud server with applications that need to send email notifications, running a local send-only SMTP (Simple Mail Transfer Protocol) server is a good alternative to using a third-party email service or running a full-blown SMTP server. In this tutorial, you will install and configure Postfix to send emails by local applications only. Choose your operating system to get started.
How To Install and Configure Postfix as a Send-Only SMTP Server on Debian 10
How To Install and Configure Postfix as a Send-Only SMTP Server on Debian 9
How To Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 22.04
How To Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 20.04
How To Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 18.04
How to Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 16.04
How To Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 14.04