I am getting this error when testing email settings:
gnu.mail.handler.TextPlain cannot be cast to javax.activation.DataContentHandler
A brief search points to a problem with Jetty 
Is this fixed in the last update or is there something else going on?
You’re on a GROOV-AR1 or GROOV-AT1 running groov View R4.3a. There’s a library mismatch in there that causes that: upgrade to R4.3b or newer and you should be good to go.
OK updating to 4.3c. fixed that error. Has anyone been able to use office365 email? Office365 (outlook.com) does not like the groov. Gmail wasn’t very happy either until I set it to “allow less secure apps”.
That one I have no idea on.