Currently it's not possible to specifically turn off the "@all" mention for a room or a user.
I found an idea in the HipChat Forum suggesting this to be implemented. Please consider voting for it and following the topic directly in it: https://help.hipchat.com/forums/138883-suggestions-ideas/suggestions/4443200-ability-to-administrativly-disable-all-for-a-room.
If this notification is becoming a problem for now I'd suggest reinforcing the users to avoid using the "@all" mention and, instead, use the "@here" mention, which would call the attention only of online users, without sending them an email. You can find further information on how mentions work at https://help.hipchat.com/knowledgebase/articles/64429-how-do-mentions-work.
Consider using HC Alias addon, to give room visitors alternative for @all. E.g. we have rooms per team, but other visitors like members of other teams can be in the room of another team, and they would not like to be notified through @all but still you want to allow visitors to address team members only. So using HC Alias addon in every room we defined @team alias with only team members, so visitors can address team only.
Earlier this year we made the difficult decision to discontinue our team messaging tools, Stride and Hipchat. The end of life date for Stride and Hipchat Cloud is quickly approaching - February 15, 2...
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