Consider the following example:
The user has received an email for reply #25 - #28 and #30, but not #29.
If the user had muted a category/topic/tag, they would’ve not received any replies after #28, which they did though, correct?
I’ve enabled mailing list mode for everyone by default using the Setting “default email mailing list mode” that you mentioned. Further, “default email mailing list mode frequency” is set to “Send an email for every new post” and “disable mailing list mode” is disabled.
Thank you very much for your help guys 