The full mail policy for shared servers can be found here: http://www.hostgator.com/mailpolicy.shtml
There is a 500 hourly email limit per domain on all shared servers. This limit is also applied towards mailing lists. If you send over this amount in any hour, the e-mails will fail and may bounce back with a undeliverable error.
Shared servers limit each connecting IP to 30 POP checks per hour. If you go over this, you will likely get a password error indicating your login is incorrect. To fix this, just wait an hour and it will automatically unlock. To prevent this from happening, disable automatic send/receive or set a higher time interval, such as checking once every 10 minutes.
Dedicated server accounts can send and receive unlimited emails per hour.
The full mail policy for dedicated servers can be found here: http://www.hostgator.com/dedicated-mailpolicy.shtml
I get a bounce back indicating my email has been tagged as spam due to exceeding a 500 e-mail per hour limit.
You will need to wait until the next hour to continue sending emails.
If this problem does not go away by the next hour, please email abuse@hostgator.com
CAN-SPAM rules
Online businesses that use e-mail marketing must be careful to follow all the CAN-SPAM rules.
All recipients must have opted in.
An unsubscribe mechanism must be included.
A link to your Privacy Policy must be included.
Your physical postal address must be included.
Deceptive subject lines and false headers are outlawed.
