I have "mailing list mode" turned on and just saw this in a footer:
WARNING: you reached the limit of 100 daily emails. Further email notifications will be suppressed.
Perhaps we should raise this limit?
You're admin. Feel free to change to something reasonable.
I think no limit is probably not reasonable, but maybe?
Ouch. I finally moved to the app because using Discourse by mail is just too painful.
I increased it to 1000.