Hi, I am running K9-mail on a Samsung Galaxy SII, and it's been really great until recently I came upon this weird problem that I've drawn a complete blank with. Basically everything works fine except that when I try to send an email over the mobile network using my BT Internet account, I get a "522 unsecured network or connection" error and the mail isn't sent. I have another email address which is POP 3 with a hosting provider and it works fine. The odd thing is that if I turn on Wi-Fi and send via that it works - so I figured it must be a BT thing, but I tried turning off Wi-Fi on my iPad and sending via the mobile network with it and it worked fine. Every other way of sending email with the account works fine: Outlook on my PC, the iPad, webmail, you name it...just when I try to send with K9 from my Galaxy over mobile network I get the 522 error. I'm really only posting here in desperation in case anyone has heard of anything like this. I tried BT's email support but of course they just sent a useless machine-generated diagnosis that was nothing to do with the problem, and when I re-submitted the problem they've gone silent. I tried the K9-Mail wiki on Google groups but not much response. Thanks in advance for any replies.