@Lydia_Pintscher and I individually noticed that emails that MediaWiki was supposed to send didn't reach us. The email accounts are hosted by different companies (gmail and 1and1), thus I suspect a problem within the Wikimedia infrastructure.
please add more details: which email addresses, around what time should they have been sent, the mail subject if you know it
without that we don't really have anything to check the logs for
I should have gotten for example an email about this edit to email@example.com: https://www.wikidata.org/w/index.php?title=Wikidata:Requests_for_comment/Improve_bot_policy_for_data_import_and_data_modification&diff=282222909&oldid=282160626
I am still not getting emails for some edits. This one for example should have triggered an email to me but I did not receive it: https://www.wikidata.org/w/index.php?title=Wikidata:Requests_for_comment/Improve_bot_policy_for_data_import_and_data_modification&diff=283379690&oldid=282545988 Some other edit notifications from the same wiki on the same account do arrive fine.
I did check my spam folder.
Is there anything else I can provide?
I can't really make out a pattern. They are mostly in the project namespace but that mught just be due to me watching mostly project namespace pages with that account and not caring about it content pages too much (I handle these with my private account).
They are on my watchlist.
I notice the issues because I usually go through my email notifications and then to the watchlist page on-wiki. I open all my edit notification emails and click the link to see all changes since the edit has been made. So there should not be any unwatched pages besides the ones where the first un-checked edit was a minor edit.