I read all the comments and my response is this...
First of all, there is no limit to the amount of emails that discourse will
send out. That is a site parameter, and whomever supports it for Fedora
needs to change it:
https://meta.discourse.org/t/daily-limits-for-outgoing-mails-per-user/41458
If the requirement is that discourse completely replicate 100% the
functionality of mailing lists, that is unreasonable and isn't going to
happen. As I mentioned earlier there are several groups working on this or
have done migration from mailing lists to discourse:
https://discourse-mediawiki.wmflabs.org/t/lets-try-to-emulate-a-mailing-l...
https://meta.discourse.org/t/discourse-vs-mailing-lists-majordomo-or-othe...
You can find more examples with a web search.
A key comment was: "Our site is still quite busy, although some people are
still grumbling about the change, 8 months later. The die-hard email users
are still able to participate, which came as a bit of a pleasant shock to
them. I think they were fully expecting that once we moved to a modern
platform, they’d be forced to use a web interface."
Personally, I don't like my mailbox filled up with mailing list postings.
I prefer to uses the discourse rss interface to scan for topics and then go
directly to it to respond. Instead of writing a "me too" email, I can
simply click a like button to show I'm in agreement. It's easier to see
the full context of a thread. With the current situation I have to go scan
the archives. I like to use the mobile app to read and reply from my
phone. For every item mentioned about discourse doesn't do A, B, C with
mailing lists I can counter with an item that email lists cannot do. The
fact is that for the vast majority of people, the discourse mailing list
functionality is good enough - and as time goes on it continues to improve
- but again, it's not reasonable to expect or demand 100%. IMO the pros
outweigh the cons.
The top of this email thread is: No longer supporting mailing lists
and my understanding is that Fedora is searching for people to take over
support. Seems to me that is a good time to consider switching to
discourse. From reading experiences of people who did the migration, it's
easier to support.