I guess this is really more of a general meta.stackoverflow question:

Putting @ before a username in comments makes it show up in their inbox. What about if the username contains spaces - does the same thing still work, or are any modifications needed? E.g., if I want to point something out to user "Joe Shmoe", should I use "@Joe Shmoe", "@JoeShmoe", "@Joe_Shmoe", or just "@Joe"?


Strip the spaces out. In your example, you want @JoeShmoe.

For more details, the FAQ entry for comment notifications on Meta Stack Overflow is here: How do comment @replies work?

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