[Android Apps and Games] vertigo_2_20:
Thanks. I thought the OS would know to alert applicable apps in such cases, and so apps being optimized just meant they wouldn't be able to be active on their own in the background, but they would still be woken as necessary by Android. I guess it shouldn't surprise me that it's not that smart.

Yeah, that's my concern. I saw elsewhere in this thread that it's so limited, so I'm not sure how I could capture any issue related to it stopping syncing. Is there no way to do a longer-lasting log only for specific things such as sync errors or whatever might be causing that?

Ok, so you're saying that in order to have it show a specific account's inbox only, I'd need to remove all other accounts from the unified inbox and then have it display the unified inbox, which at that point would only be the one. I definitely think an option to just select one to show would be better, both due to being more simple and obvious and to be able to do so without eliminating the option of using the unified inbox when desired.

I'm well aware that Google has been pushing to eliminate SD storage, which is a big reason I've always refused to buy a Nexus/Pixel. Even with a large amount of internal storage, external storage still has its benefits. And many phones, mine included, simply don't have enough storage, especially when you consider bloatware, system apps updating but not replacing older versions, causing them to take more and more space, and apps getting increasingly larger. As it is, I have 32GB internal storage on my phone and am always fighting to free up space, and it's the ONLY reason I'm looking for an upgrade, otherwise I'd happily keep it for another couple years (it's already >2 years old).

I'm also aware it would be ideal to store a minimal amount of messages locally and do server-side searches, etc, but few things are as frustrating as needing to check something in my email and having no or slow service. I know it's not ideal for various reasons, but for the reason of being able to actually access my mail, which is the whole point of a mail app, I find it extremely helpful, and even borderline necessary, to store as much as possible on the device, hence my desire to do so on external storage.

It sounds from the answers like it's not necessarily that it can't be done, but that doing so could potentially cause issues. Apps can still use external storage, they're just limited to where on that storage they can access, unless granted full access. What it looks like to me is that FairEmail could do it, but that if set to do so and the external storage were removed/dismounted/etc, it would cause FE to malfunction, because it wouldn't be able to access stored messages or store new ones. If that's the case, I can understand that, though I would still prefer the option and to just understand that would happen (which I already knew and a warning could be used that users would have to accept before it would switch). But I also understand that between external storage becoming less necessary and most users not wanting/needing to store large amounts of their email on their device (and presumably that the messages wouldn't be encrypted on external storage), this would probably be more work than it's worth, since it would probably be more than just adding an option and having FairEmail switch storage location, but would require adding in a bunch of code to handle things if/when there's an issue with the card.