Many email systems and most ISPs limit the number of emails that you can send at one time.
Further, most ISPs guard against bulk emailing, as it is often spam. Constant Contact is a
recognized email marketing service and has strong relationships with ISPs. These relationships
make it easy for you to send bulk email.

While your email address is listed as both the “from”, and “reply to” address, the email is
actually being sent by Constant Contact’s server — recognized by the ISPs. Today, Constant
Contact sends over 650 million emails every month on their customers’ behalf.