I'd like to generate a list of all contacts who have received a mailing and have never opened any of them... How can I do that?
Something like via Adv Search
create Group A based on eg CiviMailing > Delivery Status = Successful
create Group B based on eg CiviMailing > Trackable opens = Opened
by my reckoning this should mean you can then find everyone who has had a deliver and exclude everyone in that group who has ever opened
- use Custom Search Include/Exclude to say "Group A minus Group B" /civicrm/contact/search/custom?csid=4&reset=1
May not be exactly what you need but may give you an approach to try. If you have trouble finessing making your Groups via Adv Search then try Search Builder
Alternatively SearchKit may be able to do this in a single query (would need to be on a very recent version of civicrm)
Note: the concept of 'opened' is tricky as it will depend on how each person's mail app treats mail. So a more certain (but different) search may be to exclude all those who have clicked a trackable url.