I am looking for an e-mail client for my Android. The problem is -- the only email clients I can find are designed with the "syncing" mentality that is all the rage on mobile platforms. I would like an e-mail client that thinks the way my Thunderbird thinks on my desktop.
What are the specific things I must have? For one thing --- I want the option to be able to set things so that when I download a message to my e-mail program, they are right there-and-then deleted from the server --- as opposed to them sitting on my server until I delete them from the local device. That used to be an option in the pre-mobile ear -- these days we're being stripped of that very-useful option.
Also - for organizing my e-mails, I don't want the very-limited category format that is provided by the e-mail host. I want to be able to have folders (and even sub-folders) - just like I used to --- and to be able to custom-program filters that would automatically determine what folder an e-mail goes into when I download it.
I want the option to set it so that E-mail will immediately delete from the server the moment I download it --- and then the one copy will remain on my e-mail client until I remove it ---- and I want to be able to export messages to files (either individual e-mails or several at a time) before I delete them --- so that I can save long-term copies elsewhere.
Once upon a time, in the desktop era, none of this was too much to ask for --- but these days when I search for an e-mail client for my Android, it's like I'm asking for private ownership of the moon!
So my question is --- is there any e-mail client available for the Android that can do what once was no problem at all?