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Gmail offers a feature called “mute” that silently archives future email that arrives in a thread. It makes reply-all threads way nicer to work with.

Is there an add-on or something that enables this behaviour in Mail?

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Any news in this thread? – regedarek Dec 12 '13 at 10:23

This can be done in stock, but it takes a few steps.

First, go to Mail » Preferences… and in the General tab, set New messages sound: to None.

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Then, click the Rules tab.

Create a new rule.

Under description, type Sound.

Set the rule to apply if all conditions are met.

For any thread you do not want to sound the new messages sound, enter the content of its subject line (not the Fwd: or Re: parts) in the field for Subject then does not contain.

For the action, set Play Sound to New Messages Sound.

enter image description here

Whenever you want to add a thread to the exclusion list, add a condition.

If you frequently add threads to this list, this process can be scripted -- but writing that script would be another question (which you're welcome to post if you want to go this route).

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Thanks for your answer Daniel, but I'm not as concerned with the audible sound the messages make when they arrive in a particular thread but that I just don’t see new messages in a muted thread appear. – Edward Ocampo-Gooding Jul 13 '12 at 2:33
@EdwardOcampo-Gooding Do you want them to be marked as read? If so, same procedure, but change the payload – instead of all, say any; instead of Does not contain say contains; instead of Play Sound say Mark as read. – Daniel Jul 13 '12 at 3:06
Yep, that’s what I’m after. Is there a hotkey I can hit from the regular mode to add the current subject to a rule? Where should I look if I need to script this kind of action? – Edward Ocampo-Gooding Jul 13 '12 at 17:22
You could post a question on this site asking for such a script :-) – Daniel Jul 13 '12 at 18:29
(I'm working on writing such a script; if you post a question asking for an AppleScript to mark all future messages bearing a particular subject line as read, I hope to be able to post an answer to it) – Daniel Jul 13 '12 at 18:49

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