Share your experience!
Hello,
yesterdayi have upgraded my sony z2 D6503 to andriod 5.0.2 --> 23.1.A.0.690, and then my email client stopped working for IMAP.
i get the same error and i have tried several email clients from the play store, and none of them was able to connect to the email server.
Regards,
hoping to hear from you soon to fix this issue.
Topic edited and moved by Rickard
it is IMAP,
however, the issue got resolved after i deleted the old account, rebooted my mobile and run a fresh email client setup....
it was not sync'ing after the upgrade, apparently because it is a new client and have a different certificate than the old one ??? not too sure though.
thanks for the help.
Glad to hear that it works now 
Hi.
I have the same problem on my new phone.
But the error is then i connect with WIFI. With mobile data e-mail synchronised well..
What can i change in my settings to fix it?