What do I do if my email is rejected due to RBL?

If your email has rejected due to an RBL (Real-time Blackhole List), then please follow the steps below so you can send the email:

  1. Find out who the IP address belongs to. You can check this at https://www.whatismyip.com/
  2. Once you have found out who the IP address belongs to, scan any machines/devices related to that IP address and remove any malware / spyware / viruses.
  3. Then you can check at https://mxtoolbox.com/blacklists.aspx to see which RBLs the IP address is on and request de-listing from the appropriate websites.
  4. After de-listing the IP address, you will be able to send the email again.