---
title: "Filters & blocking"
description: "Spam filtering decides what is junk. This is the other half: what you have decided you do not want, however legitimate it is and whoever it is from."
url: "https://nextmail.sh/docs/knowledge/filters"
area: "Knowledge base"
category: "Filters & blocking"
---

# Filters & blocking

Spam filtering decides what is junk. This is the other half: what you have decided you do not want, however legitimate it is and whoever it is from.

## In this section

- [Block a sender or a domain](https://nextmail.sh/docs/knowledge/filters/block-sender.md): One address, or everything from a domain, stopped before it reaches you.
- [Bad-language filter](https://nextmail.sh/docs/knowledge/filters/language-filter.md): Mail carrying the words you do not want to read does not open in front of you.
- [Rules you write yourself](https://nextmail.sh/docs/knowledge/filters/custom-filters.md): Your own conditions, and what should happen to anything that matches them.
- [Out of office](https://nextmail.sh/docs/knowledge/filters/out-of-office.md): An automatic reply from one address while you are away, with a start, an end and your own words.
- [Subscriptions](https://nextmail.sh/docs/knowledge/filters/subscriptions.md): Every newsletter and mailing list that writes to you, in one place to unsubscribe from, file away or block.