My wife has K9mail on her Nexus7 and does not use either the default email app or the gmail account which Google required to be set up.
Most of the time it works swimmingly, but sometimes emails can accumulate in the ‘Outbox’ for days before they finally get sent. These are all just text with no images or attachments.
I suspect (although I can’t be sure about this) that when this happens the final dispatch occurs when an email comes in, although I think sometimes emails come in without the dispatch happening.
Has anyone got an explanation for this behaviour? Or, better still, a suggestion for making sure of speedy dispatch? I guess it occurs about once every 6 weeks or so.
Polling interval for incoming mail is set to every 10 minutes.