I have been receiving email (Plusnet ISP) on my phone for several months without any problems but now the acount has been deleted from the phone. I reentered all the details and it worked ok but when the app was closed and restarted all the setup details had been deleted.
I am experiencing the same on my doro 8040. The phone looses my e-mail address after putting it to flight mode. I retains the gmail settings though.
All the plusnet Account information has been deleted, but the gmail account details are still all there. I'm wondering if there is a fault somewhere, strange it only happens on one of the two email accounts and has been fine for the last year.
Hmm.. Odd. Can you check Settings -> Accounts if the email account is still there when you close the email app.
As far as I remember no settings were changed - which ones would be relevant? The email App is the one that comes with Doro - no new apps have been loaded.
Did you change any settings on the phone before that happened? Also, which email app are you using?