Mail · 6 steps, ~2 minutes

Microsoft ended support for the Windows Mail app on December 31, 2024. It still opens, but it can no longer send or receive email, so a signature you set here will never go out on anything. If you send mail on Windows, use our Outlook (new) guide instead. The steps below are here for anyone still opening the old app.

1
Open the Mail app and click the gear icon in the bottom-left corner to open Settings.
2
Click Signature.
3
Choose the account this signature is for from the dropdown, or check "Apply to all accounts."
4
Turn on the "Use an email signature" toggle.
5
Click into the text box and paste your signature.
Make your signature first →
6
Click Save.

Good to know

Even before support ended, Mail's signature box only ever accepted plain text — no bold, colors, links, or images — so your logo and formatting wouldn't have survived a paste here regardless.
New Outlook uses a completely separate settings screen, so nothing you set up here carries over automatically; you'll need to add your signature again there.