Automatically add a signature to a message
You can create an email signature that you can add automatically to all outgoing messages or add manually to specific ones.
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Select Settings at the top of the page, then
For Outlook.com, select Mail > Compose and reply.
For Outlook on the web, select Email > Compose and reply.
Under Email signature, type your signature and use the available formatting options to change its appearance.
Select the default signature for new messages and replies.
Select Save when you're done.
Manually add your signature to a new message
If you've created a signature but didn't choose to automatically add it to all outgoing messages, you can add it later when you write an email message.
Go to your mailbox and choose New email.
Type your message, and then choose > Insert signature at the bottom of the compose pane.
When your email message is ready, choose Send.