A technique that allows you to limit the number of email messages sent to a domain within a certain time frame. It is used to comply with ISPs and to avoid tripping spam filters. Many ISPs have their own policies and preferred limits.

Building an Opt-In List, Building Relationships
If you aim for success, you must do everything within your means to achieve that. You just donÃt go on sitting there in your house complaining about not getting as much profit as you expect.

