if this is only issue with the css files and if you also have nginx on your system then please remove css from Serve static files directly by nginx for particular domain settings and it should help
another good tool to test your emails is Newsletters spam test by mail-tester.com here you can send a test email and it will test your email on various factors you can try sending test email to that tool to see if you can locate any issues there
another way to recover from this thing is stop mysql on your current server and then copy the mysql directory to another server where same mysql version is installed. Then try to start the mysql on another test server with your existing mysql directory there you can take dumps of all your...