Ok, according to ATT suport
your configuratin looks good.
IT's possible that an item in your inbox or outbox causes the issue
In WE Mail
create a new folder under Storage Folders: Client_Inbox
--> move everything in the Inbox to the new folder Client_Inbox
create a new folder under Storage Folders: Client_Outbox
--> move everything in the Outbox to the new folder Client_Outbox
Now log on to the web based ATT mail
create a new folder: Srvr_Inbox
--> move everything in the Inbox to the new folder Srvr_Inbox
create a new folder: Srvr_Outbox
--> move everything in the Outbox to the new folder Srvr_Outbox
This does a few things
1) if there is an object causing the error, it is no longer part of the regular eMail processing
2) it shrinks the eMail client index
3) it backs up your inbox (probably nothing in your outbox to back up)
4) there are fewer objects to check between cleint and server
I employ filters to move inbound mail to specific folders under Storage Folders. It takes a little thinking, but easy things can be organized - family, friends, work, news, sports.
Let me know if this helps o we need to take a differnt tact.
You might have missed the sentence in my post asking you for the account inforamtion that said
"use the eraser to clear your email infomation (see arrows in pics)"
You should edit each of your posts and just remove the image.
scroll down to advanced option and click
--> delete any attached image
You can leave the last one if you want, the one without personl info.