---
title: "Mail App for MacOS: Signing & Encrypting Email"
slug: "mac-mail"
updated: 2023-05-11T18:22:58Z
published: 2023-05-11T18:22:58Z
canonical: "docs.axiad.com/mac-mail"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.axiad.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Mail App for MacOS: Signing & Encrypting Email

In the Mail app, you can send messages that are digitally signed and encrypted. Mail automatically discovers appropriate RFC822 case-sensitive email address subject or subject alternative names on digital signing and encryption certificates on attached PIV tokens in compatible smart cards.

If a configured email account matches an email address on a digital signing or encryption certificate on an attached PIV token, Mail automatically displays the **Email Signing** button in the **New Message** toolbar. If Mail has the recipient’s email encryption certificate, or can discover it in the Microsoft Exchange Global Address List (GAL), a lock icon displays in the **New Message** toolbar. A lock icon indicates the message will be sent encrypted with the recipient’s public key.