How to Prevent Your Constant Contact Emails From Being Blocked

If you believe your email campaigns are being blocked by an ISP or mail server as opposed to being filtered, we suggest you start by reaching out to your subscribers (contacts) or their ISP (Internet Service Provider) directly.

If numerous subscribers from the same large domain (such as Gmail, Hotmail or Yahoo) or ISP (Comcast, Road Runner or Verizon) are appearing in the “Blocked” bounce category in your account, please contact the Constant Contact telephone support team directly so they can take steps to resolve the issue.  Constant Contact's ISP Relations Team has experience working with these large providers and will work to resolve the problem on your behalf.  They can be reached at 781.472.8103

For smaller ISPs and domains Constant Contact have created the following letters to help you communicate with your subscribers and their ISPs.  Once the letters have been handed off, Constant Contact's ISP Relations Team will work with the appropriate individuals to resolve the issue.  The ISP Relations Team is available (via the ops@constantcontact.com address included in the letter) should the ISP/Domain require follow-up information such as mail logs.  While working with Constant Contact on this issue, we have found this approach usually yields much faster results since the admins are hearing from their own users who want the mail.

Important: When you copy and paste these letters into an email sent via your standard email and not through Constant Contact, please be sure to replace the XXX placeholder with more specific and appropriate information before sending it to either the contact or ISP.

Letter You Send to Your Subscriber

To: Contact Subject: Contact Your ISP

Hello (YOUR SUBSCRIBER NAME HERE...),

I am emailing to alert you that your ISP is blocking the newsletters/promotions/announcements you have subscribed to receive. I know that you would like to receive these valuable communications, so I ask that you send the attached letter to your ISP's customer support department. Please be sure to replace in the (YOUR NAME HERE) areas below.

As you may know, Constant Contact powers the email communications I send. When you receive a response from your ISP, please forward the response email to the following address: ops@constantcontact.com. The Operations Department at Constant Contact will follow-up with your ISP once they receive your email.

I apologize for any inconvenience this may cause you.

Sincerely, (YOUR NAME HERE)

Letter Your Subscriber Sends to their ISP

To: ISP Customer Support Subject: Remove Constant Contact Block

Hello. My name is (YOUR NAME HERE) and I have been a customer of your services since (LIST YOUR DURATION OF SERVICE HERE). I understand that you employ filters and/or blacklists to protect customers like myself from unsolicited email; however, this has made it impossible for me to receive newsletters, announcements, and promotions that I have requested. I value these communications and would like to receive them using this email address.

The sender of these emails uses an email marketing service called Constant Contact. Constant Contact is not an open relay and has strict anti-spam policies in place. Because your filters block emails from Constant Contact I am unable to receive these communications.

I ask that you please help me determine why these emails are being blocked. For further information about Constant Contact or to request more information from them such as log files, the Operations team can be reached at - 781.472.8103 or ops@constantcontact.com.

Mail from Constant Contact can be found by the following characteristics for whitelisting:

"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 208.75.123.134     ccm134.constantcontact.com 208.75.123.135     ccm135.constantcontact.com 208.75.123.161     ccm26.constantcontact.com 208.75.123.162     ccm27.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 208.75.123.167     ccm167.constantcontact.com 208.75.123.168     ccm168.constantcontact.com 208.75.123.169     ccm169.constantcontact.com 208.75.123.170     ccm170.constantcontact.com 208.75.123.171     ccm171.constantcontact.com 208.75.123.172     ccm172.constantcontact.com 208.75.123.173     ccm173.constantcontact.com 208.75.123.174     ccm174.constantcontact.com 208.75.123.175     ccm175.constantcontact.com 208.75.123.176     ccm176.constantcontact.com 208.75.123.177     ccm177.constantcontact.com 208.75.123.178     ccm178.constantcontact.com 208.75.123.179     ccm179.constantcontact.com 208.75.123.180     ccm180.constantcontact.com 208.75.123.181     ccm181.constantcontact.com 208.75.123.182     ccm182.constantcontact.com 208.75.123.183     ccm183.constantcontact.com 208.75.123.184     ccm184.constantcontact.com 208.75.123.185     ccm185.constantcontact.com 208.75.123.186     ccm186.constantcontact.com 208.75.123.193     ccm33.constantcontact.com 208.75.123.194     ccm34.constantcontact.com 208.75.123.195     ccm35.constantcontact.com 208.75.123.196     ccm36.constantcontact.com 208.75.123.197     ccm197.constantcontact.com 208.75.123.198     ccm198.constantcontact.com 208.75.123.200     ccm200.constantcontact.com 208.75.123.201     ccm201.constantcontact.com 208.75.123.202     ccm202.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 208.75.123.245     mail245.nutshellmail.com 208.75.123.250     ccm37.constantcontact.com

Please contact me when this problem has been resolved.

Sincerely, (YOUR NAME HERE)