I’m sure I configured the default email digest to never before but alas I’ve stumbled over the settings page and it’s set to weekly. Trying to set it to never gives me a red ‘value’ error message:
Any clues?
The digest emails are by far my biggest gripe as a user of discourse forums. I wish this was opt-in on all sites by default.
This is a confirmed bug, @zogstrip will have a look
Surprisingly, nobody has ever complained about the weekly email digest defaults. Literally nobody!
Note that we only send digests for a maximum of 1 year past your last visit date and the digest default is weekly. We could probably move that down to every two weeks as a default. We also filter digests to just trust level 1 or higher posts, and digests obviously are not sent if there are no new posts…
But the status quo seems to meet people’s expectations or at least be a reasonable balance between reminding people that your site exists, by mailing them some interesting content, versus nagging them constantly with spammy emails.
I am always interested in hearing specific suggestions to make the digests better.
Thanks for reporting that issue. I just pushed a fix 
https://github.com/discourse/discourse/commit/b9a9a91335cede1e591e4fa3c9445da27742b7e1
