Can this be done? Let's say: I buy 5 small servers. All setup with simple VestaCP and their SMTP servers are enabled with dovecot. In my main server with Mailwizz, I add all the 5 servers under "SMTP". Then I set "Change Server" at every 10 emails. Will Mailwizz change rotate the 5 servers at every 10 emails sent? Is that how "Change Server" works? And do I look at Application Log in "Miscellaneous" to see if it works?