November 11, 2011 In an effort to further curtail spam, we have added two more blacklists to our mail server. These blacklists are run by Mailspike. We are now utilizing two of their lists – their reputation data (blocking the IPs with the worst reputation for sending spam) and the zero-hour data which blocks IPs which are actively part of a spam attack. You can read more about the lists here. If you would like to check an IP address against these lists, you can do it here.
To check an IP address against other blacklists, you might want to visit this site: http://www.mxtoolbox.com/blacklists.aspx.
If you are having trouble with legitimate email being blocked, please call us at 256-547-6817 or email firstname.lastname@example.org. We will be deciding whether or not to keep using these blacklists based on customer feedback.