Mailing Config resetted to: SMTP localhost/ Port 25
If I change and save it, it falls back to SMTP localhost/ Port 25 after reload the page.
If I only change server and port, 'no change to save on parameters' appears. I have to change another field, that it saves successfully.
Version is 8.6.6.
Maybe happened first time upgrading from 8.6.5, but im not sure
For unknown reason there has been values for SMTP Server and Port (localhost/25)
in parameters.php
I removed these default values and everything works again.