It is important to know if your website’s IP is blacklisted by spammer directory. Spammer directories provide lists of IPs from which spam distribution is reported. Emails sent from the blocked IPs are subject to closer scrutiny and are much less likely to be delivered.

One important factor to understand is that your server does not have to send spam in order for your IP to get blacklisted. Many websites are hosted on a single IP with shared hosting accounts. If one domain on shared IP is reported as distributing spam all other websites on the same IP are affected.

How to verify if my IP is blacklisted?
There are over 120 public blacklists but there are few that can really cause problems for email delivery. You can check your domain name or IP against multiple lists at once by using blacklist check aggregators. For example:
– multirbl.valli.org
– dnsbl.info

What to do if my website’s IP is blacklisted?
1. Contact you hosting provider.
2. Verify that your website is not sending spam without your knowledge.
3. Submit removal request (www.stopforumspam.com/removal)

If after 5 – 10 business days your IP is still being blacklisted repeat the cycle again. You might also consider changing your IP or hosting provider if it is not possible to be removed.

For email campaigns it is recommended to utilize professional email services to ensure that your website IP is not blocked. Here is a list of some popular email services in no particular order:
– Mailchimp (mailchimp.com)
– Constant Contact (www.constantcontact.com)
– Campaign Monitor (www.campaignmonitor.com)
– Mad Mimi (www.madmimi.com)
– iContact (www.iContact.com)
– Stream Send (www.streamsend.com)