Whitelisting and feedback loops — We have relationships with major ISPs like AOL, Hotmail, Yahoo! and many more that mean our mail servers are recognized as legitimate senders of bulk email, so your campaigns have a much greater chance of being delivered.

Monitoring of blacklists — We continually check blacklisting services to make sure our servers are not being listed, something which is time consuming and complex to do for your own servers.

Specialized network of mail servers — our mail servers optimize email delivery for particular recipient mail systems, throttling the speed of delivery to match acceptable levels for each system.

Dealing with spam complaints — Sometimes people forget that they signed up for your emails, and hit the spam button. Campaign Monitor instantly removes people from your list when they make a spam complaint, ensuring they do not receive any more email.