How to Remove Constant Contact Block

If you're having trouble receiving CTL newsletter or emails, it may be because your company's ISP or mail servers are bouncing or filtering emails sent from the email marketing service called Constant Contact. Constant Contact is not an open relay and has strict anti-spam policies in place.

Below is the information that your company's ISP or mail servers will need to allow in order to receive emails from Constant Contact and CTL.

For further information about Constant Contact or to request more information from them such as log files, the Constant Contact Ops team can be reached at - 781.472.8103 or ops@constantcontact.com.

Please forward this information to your IT group.

Mail from Constant Contact can be found with the following characteristics: "Envelope from:" domains:

@in.constantcontact.com
@in.confirmedcc.com

Sending IPs

All mail from Constant Contact is sent from:

IP Range: 208.75.123.0 - 208.75.123.255
CIDR: 208.75.123.0/24
Network/Netmask: 208.75.123.0 255.255.255.0

Specific IPs sending from this range:

208.75.123.1       coi001.confirmedcc.com
208.75.123.2       coi002.confirmedcc.com
208.75.123.3       coi003.confirmedcc.com
208.75.123.103   coi103.confirmedcc.com

208.75.123.130     ccm22.constantcontact.com
208.75.123.131     ccm23.constantcontact.com
208.75.123.132     ccm24.constantcontact.com
208.75.123.133     ccm25.constantcontact.com
208.75.123.161     ccm26.constantcontact.com
208.75.123.162     ccm27.constantcontact.com
208.75.123.225     ccm29.constantcontact.com
208.75.123.226     ccm30.constantcontact.com
208.75.123.227     ccm31.constantcontact.com
208.75.123.228     ccm32.constantcontact.com
208.75.123.193     ccm33.constantcontact.com
208.75.123.194     ccm34.constantcontact.com
208.75.123.134     ccm134.constantcontact.com
208.75.123.135     ccm135.constantcontact.com
208.75.123.195     ccm35.constantcontact.com
208.75.123.196     ccm36.constantcontact.com
208.75.123.250     ccm37.constantcontact.com
208.75.123.163     ccm38.constantcontact.com
208.75.123.164     ccm39.constantcontact.com
208.75.123.165     ccm165.constantcontact.com
208.75.123.166     ccm166.constantcontact.com
208.75.123.197     ccm197.constantcontact.com
208.75.123.198     ccm198.constantcontact.com
208.75.123.245     mail245.nutshellmail.com