To: ISP Customer Support
Subject: Remove Constant Contact Block

Hello. My name is XXXX and I have been a customer of your services since XXXX. 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 Ops team can be reached at - 781.472.8103 or ops@constantcontact.com.

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

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

Sending IP’s

Beginning in March of 2008 Constant Contact will start to migrate all outbound mail IP’s to one consolidated block. This may take over a year to complete and IP’s will be removed from the list below once they are defunct. All future mail from Constant Contact will be 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

If you would like to know exactly which IP’s in this block are in use, please contact ops@constantcontact.com

Legacy IP addresses still sending these emails:

Please contact me when this problem has been resolved.

Sincerely,

XXXXXX