Issue Summary

This is reproducible on Data Center: yes

Steps to Reproduce

1. Configure a mail configuration if one doesn't exist
   1. Save the configuration if it's a brand new one
2. Change the value of any field other than `password`
3. The update will fail due to a connection error.
4. If you also change the password to the correct it will succeed.

Expected Results

You should be able to update any of the fields and it should succeed.

Actual Results

The below exception is thrown in the xxxxxxx.log file:

Cannot test connection

We couldn't connect to the mail server. 

Workaround

The workaround is to also fill in the password field when updating other fields. This does not affect the actual mailing system and notifications go out as normal.