Email password too long?
I struggled for 3 days after changing my password to be able to log on from my android phone, or tablet. I was able to log in with Thunderbird, and with webmail in a browser, but neither my phone or tablet. So I changed my password again, from one that was 13 characters to one that was 9 characters. Presto! Everything works again. Perhaps this bears some investigation, and an addition to the tutorials for future frustrated tech neophytes.