Not a big fan of the quick look. I’d personally like to be able to have a button right there to save the image instead of having to open the drop down at the top of the screen (don’t rly like the placement of that either, but I digress).
Currently it’s also the case that if you swipe the image up or down it doesn’t close the quick look, you have to manually press done for the bigger preview to close.
You could check out Tutanota, fastmail and mailbox.org. They aren’t that expensive and from what I’ve heard all work pretty well. Protonmail is another option, but is a bit more expensive. If you opt for an annual or semi-annual subscription the difference isn’t huge compared to the other ones I mentioned.
This is a known issue and is being worked on. Follow this issue to stay up-to-date on the progress: https://github.com/mormaer/Mlem/issues/308
This is something that is being worked on. You can follow the status of this change here: https://github.com/mormaer/Mlem/pull/239
Can’t you make a reverse alias through the SimpleLogin ui? Since that’s what proton pass uses for the aliases.