I'm starting to think it's due to "you get what you pay for." Yes, I've been happily using K-9 for all these years. Free and with no ads. That's hard to beat. But when a number of people are complaining about the same issue (this isn't the only thread about this issue) and the developers aren't responding, it implies they don't care. I can't keep pulling my phone from my pocket to do a manual sync to check for new mail. That's what K-9 used to do. And is supposed to do.
Last night I started exploring mail clients and after trying three, I settled on AquaMail. Trial version limited to two accounts and unlimited in the paid (5.00 USD) version. After experimenting for about four hours, I bought it. No more "syncing disabled" issues. I'll keep on eye on this thread to see what develops, but I don't have too much hope. -- You received this message because you are subscribed to the Google Groups "K-9 Mail" group. To unsubscribe from this group and stop receiving emails from it, send an email to k-9-mail+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.