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Policies for Mass Mailing and Bulk Emailing

Last Updated: Fri, 22 Apr 2011 > Related Articles


Cox Business allows mass and bulk emailing only when certain conditions are met. These policies exist to reduce spam, fraud, and abuse on the internet.


About Mass and Bulk Emailing


Mass Mailing is defined by Cox Business Services as "Opt-in" Mailings are to more than 150 users by either Cox customers or their 3rd party partner to any group of end users. Opt-in means that end user has signed up for mailings voluntarily. Opt-in implies that the mailing is not SPAM and a recipient knowingly and willingly requested to receive information via electronic distribution from the originating domain name or business referenced within the content of the email. Email distribution lists that are purchased from a 3rd party and are represented as “opt in” clean lists are not exempt from this policy and will be treated as SPAM.

Before Customer or its end users engage in mass mailings, customer must obtain written approval from Cox. The customer must complete the mass mailing request form located at, and, if approval is granted by Cox, customer must comply with all instructions and requirements outlined by Cox before customer may engage in mass mailings. Failure to comply with Cox requirements is a violation of this Acceptable Use Policy (AUP). If Cox denies customer’s request for mass mailings, customer shall not engage in mass mailings.
Mass mailing is not included as part of any Cox service offering and Customer has no contractual right to engage in mass mailings until and unless customer receives written approval from Cox for mass mailings. Cox may approve, deny, condition, or rescind previously granted permission, in its sole discretion. Failure of Cox to reply to customer shall be deemed a denial of mass mailing authorization.


Mass Mailing Requirements

  • Recipient Limits and Send Rate: When utilizing Cox Business email servers, end-users are restricted to 300 recipients per message and  100,000 recipients per hour. Cox Business e-mail servers also limit each source IP address to approximately 900 messages per hour. If Customer uses a third-party mail server or Customer’s own mail server to send mass mailings, these restrictions do not apply.
  • All email distributions must have a viable and clear option or instructions for ‘opting-out’ of the subscriber list.
  • For all email distributions, the subject of the email must match the body of the text.
  • The email must contain a valid physical postal address.
  • Valid "From", "Reply-To", "Return-Path" and "Error-To" headers. If the following values are listed in your mail header, they must be valid addresses and each email address must accept any bounces at the rate they may occur:
    -Valid "Abuse contact": customers who send/receive mass mailings MUST supply Cox with an emergency "abuse contact" to contact if there are any problems/complaints associated with the mailing.
  • Use of appropriate servers for originating mailings: The use of Cox-hosted SMTP servers or customer-owned and managed SMTP servers that traverse the COX network for mass mailings is not permitted unless previously agreed in writing by Cox.
  • If you have questions about our policy and process, please read our acceptable use policy at

Cox reserves the right to reject any request to perform a mass mailing if it is determined to be in its own best interests.



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