mattermost/doc/help/Messaging.md

Messaging

Writing Messages

You can write messages using the input box with the text "Write a message..." at the bottom of Mattermost.

Press ENTER to send a message. Use Shift+ENTER to create a new line without sending a message.

Formatting Messages

Mattermost messages are formatted using a standard called "markdown". Here are examples:

Text Entered	How it appears
**bold**	bold
_italic_	italic
[hyperlink](http://mattermost.org)	hyperlink
:smile: :sheep: :alien:	😄 🐑 👽

Check out a full list of Emojis here.

Mentioning Teammates

You can mention a teammate by using the @ symbol plus their username to send them a special notification to draw their attention.

For example, you might write:

@alice how did your interview go with the new candidate?

Which sends a special mention notification to alice to check your message.

To mention a teammate, press @ and you should see a list of team members who can be messaged. You can either type their username or use the Up and Down arrow keys and then ENTER to select them to be mentioned.

You can configure how you'd like to be alerted about mentions of your username, your first name, your nickname, or other keywords from Account Settings > Notifications and you can set channel-specific preferences from [Channel Name] > Notification Preferences