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WhatâNew @ Postmaster


Dynamic IP Ranges and Error Codes updated




What are Comcast's Outbound Mail Servers?

Outbound Mail Servers

Below are Comcast's outbound mail servers:

Host IP Address
IPv6 Outbound CIDRs

Postmaster FAQs

This page was designed to address questions on the following topics:

All policies and thresholds on this page are subject to change. This site will be updated when such changes are implemented.