Relay email (nullmailer)
Overview
Nullmailer is lightweight and simple MTA (mail transport agent) which allows to relay local mails to another server. This is useful if you are in example running private server at home and just want to relay notifications from cron etc. to your external mailbox via your ISPs mail server. Nullmailer allow also to rewrite envelope sender which is needed to pass spam checks many ISPs are nowadays doing.
Installation
Nullmailer can be found only from the testing
branch. How to Enable the Testing Repository
# apk add nullmailer@testing