At its peak, our email delivery engine can send millions of emails an hour. But that's not important if your messages are not getting delivered to the inbox. There are many ISPs and corporate email servers out there that limit how many emails they will accept at one time.

Our servers take volume limits and all sorts of other information into account when we are delivering to make sure the most emails will ultimately arrive at their destinations.

And when an email bounces we give you back as much detail as possible through our unparalleled bounce handling system so you can quickly determine why it was not delivered.