---
title: "Safety & authenticity"
description: "Two questions about a message you were not expecting: is the sender the domain it claims to be, and did a person write this. Both are answered on the message itself, next to the sender, rather than in a filter that quietly disappears things."
url: "https://nextmail.sh/docs/knowledge/safety"
area: "Knowledge base"
category: "Safety & authenticity"
---

# Safety & authenticity

Two questions about a message you were not expecting: is the sender the domain it claims to be, and did a person write this. Both are answered on the message itself, next to the sender, rather than in a filter that quietly disappears things.

## In this section

- [Verified sender](https://nextmail.sh/docs/knowledge/safety/verified-sender.md): A mark beside the sender when the sending domain’s published records line up.
- [Sender pictures](https://nextmail.sh/docs/knowledge/safety/sender-avatar.md): A real picture for everyone you correspond with when one can be found, and a mark seeded on their identity when it cannot.
- [Phishing & spam filtering](https://nextmail.sh/docs/knowledge/safety/spam-filter.md): Mail the sending domain itself disowns lands in Spam rather than the inbox.
- [Sender research & look-alike domains](https://nextmail.sh/docs/knowledge/safety/sender-research.md): Who is this, in fifty words, and is the domain a look-alike?
- [Written by AI](https://nextmail.sh/docs/knowledge/safety/ai-written.md): A label on the message when the words look generated rather than written.
- [Checks on every message](https://nextmail.sh/docs/knowledge/safety/message-checks.md): Every message you receive scored for spam, phishing and AI writing, with each check behind the scores listed.
- [Which service sent it](https://nextmail.sh/docs/knowledge/safety/sent-with.md): The mail service a message was sent with, beside the sender, and a note when it reached you through a forward.