You might also want to consider SimpleMail. It's actually a fork for FairMail. It's in the Fdroid repositories. That said, I couldn't let your post pass without making a plea that HTML email is the bane of all that is still sane and good on the Internet. While you point to an interesting case, sending detailed instructions with embedded images, realize that you have no control over the recipient's email client. Especially where people start using tables in HTML email, you can actually end up inverting the order of content. If you have something that must be displayed in a particular way, you're probably better off sending a PDF attachment. My guess is you are aware of most, if not all the issues with sending HTML email. I just felt compelled to try to convince you not to give in to the dark side.
Thank you for your suggestion. It turns out the two email clients mentioned recently are called
FairEmail and
SimpleEmail (there is a SimpleMail too, but for the Amiga). As far as I understand, SimpleEmail is basically FairEmail with the ability to pay for the "pro" features removed. Is that correct, or am I missing something?
For now, I'm still trying to just use AirMail on the Cosmo, but I keep running into the limitations of plain text. For the record, I don't
like HTML email much, and would strongly prefer widespread support for some much simpler form of rich content, akin to what we have here on OESF. Lacking that, HTML currently seems to be my least bad choice. Yes, I am aware of many HTML email pitfalls, and how to avoid some of them.
In my particular case, I
do know which e-mail clients most of the few people I send HTML email to are using, most of the time, and I rarely use anything more advanced than text attributes and inserted images. Would I need, say, table cells or a particular font, it's typically faster to use a proper layout tool and attach a PDF file, but for back-and-forth discussions with quotations and stuff (much like the threads here), relying on attachments would typically be too clunky, especially on mobile devices. As my work is fairly rich in color-coded stuff, something like "I suggest
B97A57,
CC9966 or
996633" is just more useful to my boss, than the plain hex codes alone, and it's faster and easier for both of us than attached images.