Yes, we do. We have a triple layer of protection on our servers to protect their IP reputation: 1. Outbound mail volume limitations Plesk helps ensure we limit the number of messages that can be sent per hour and per day from each domain. We set these limits to sane values such that very few of our customers ever reach them, but also so that if an account should begin emitting spam, very few spam messages make it out in any given hour or day. 2. Outbound mail relay spam scanner For the messages that do make it past our volume limitations, they're all scanned by a custom mail relay that checks the messages for spam content and drops anything overly suspicious. 3. IP reputation and blacklist reports We receive notifications every 24 hours pertaining to our SMTP servers' reputation from the 3rd party mail scanning utility MX Toolbox. Should their excellent standing drop over time, we'll be made aware and act fast to resolve the issue.