[Evolution] Unable to send mail

[Bob <sckbr windstream net>]

Have used Evolution for years, lots of folders, etc. Recently, I've lost the ability to send/reply. I'm a 
Linux Mint user as well.

Current version in use is 3.2.3. Send settings follows:

   SMTP/smpt.windstream.net/   Server Authertication is unchecked and port 587 is current. Port 25 was in use.

  Possible Linux Mint upgrade has caused the problem??

Thanks