[hownottowrite]

Sad to see this go... We use @username from external systems that feed into Slack. For example, putting a comment on a Zendesk ticket using @username alerts a person who would normally never pop into Zendesk to have a look.

[octalmage]

That's a really cool feature! We could really use that!

[hownottowrite]

If you're feeding Slack with Zendesk now, try putting an internal comment on a ticket with the @. Oh, and since Zendesk forced everyone to the rich-text client you need to escape out of the automatic name selection dropdown or it will show up in Slack as @username which does not trigger the mention.