To be specific I do miss several notification emails for changes on meta, wikidata and dewp. I do receive some notification emails from these wikis but apparently not all.

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 lydia.pintscher@wikimedia.de: 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

@Lydia_Pintscher

i checked our mail logs, and i can confirm there are 4 emails that have:

• been sent to lydia.pintscher@wikimedia.de
• on December 10
• origin is wikidata wiki

all 4 ended with the status "Completed" and have been delivered to mxlb.ispgateway.de

@hoo i can't confirm an issue on our side. i also see mail delivered to you on that day, but @wikimedia.de and both are H=mxlb.ispgateway.de which other account (gmail vs. 1and1) were you talking about?

In T121105#1874898, @Dzahn wrote:

@hoo i can't confirm an issue on our side. i also see mail delivered to you on that day, but @wikimedia.de and both are H=mxlb.ispgateway.de which other account (gmail vs. 1and1) were you talking about?

Ugh, seems I got confused here. I actually received all emails I should have received.

Alright, so @hoo you think we can close it as invalid then?

@hoo @Lydia_Pintscher if you disagree please reopen the ticket again. thanks

Another one: https://www.wikidata.org/w/index.php?title=Wikidata:Project_chat&diff=283743387&oldid=283679751

@Lydia_Pintscher hmm, any similarity between the ones that don't work vs. the ones that work? Like for example these are all in the Wikidata: namespace but maybe others are not? Do you see any pattern like that at all? You are also sure these are all on your watchlist?

Another one: https://www.wikidata.org/w/index.php?title=Wikidata:Showcase_items&diff=283781453&oldid=278234143

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.

(It also doesn't seem restricted to Wikidata. Similar things seem to happen with dewp and mediawiki at least. Though I have considerably fewer pages to watch there so not as obvious.)

Could i have another pair of eyes here please? I don't really see a pattern here, unsure how to go ahead with debugging. I apologize for the delay.

In T121105#2046743, @Dzahn wrote:

Could i have another pair of eyes here please? I don't really see a pattern here

Wondering if it's another case of those items I listed in https://lists.wikimedia.org/pipermail/engineering/2016-June/000211.html

@hoo, @Lydia_Pintscher : Still an issue, 18 months later? Or should this task be closed?

In T121105#3860761, @Aklapper wrote:

@hoo, @Lydia_Pintscher : Still an issue, 18 months later? Or should this task be closed?

I haven't had any (apparent) issue any time recently. So closing this is fine with me.