When updating e-mail server settings having "Send a test e-mail after

saving" selected it is helpful to get some feedback when the e-mail

could not be sent. With this change an error message is displayed and

the exception logged.

Configured e-mail server (smtp.gmail.com) with wrong username, wrong

password, no TLS, misspelled server and observed error message and

exception in log for every case. Using an invalid port resulted in a

timeout.