A link to "Send email via a secured port" will be sent via email.
We hate spam. The information you've entered will not be shared or sold.
To help maintain your company's outgoing email security, follow these instructions to configure your modem.
The Comcast Customer Security Assurance Team recommends configuring your outgoing mail server settings to a secured port. If you use an email client (for example; Outlook, Outlook Express, or Thunderbird) and send through a third-party domain/server (for example, Gmail) using Simple Mail Transfer Protocol (SMTP), you may be unable to send email if a block has been placed on port 25 within your client. If this is the case, you will receive the message shown here:
This can be resolved by configuring the email client to send via alternate port 587, a secured port that requires authentication.
*Note: Some of these steps will vary depending on the email client in use (for example, in Outlook 2007: select Tools > Account Settings, then select the account and click Change.
For additional assistance configuring your modem's port settings, contact the Customer Security Assurance team at 1-877-807-6580.
Outlook 2003/2007 and HMC Webmail users are not impacted if a block is placed on port 25.
For the protection of the network and our customers, Comcast Business Internet blocks certain ports.
Learn about how to resolve issues related to email bounce back messages.
Having problems with your Comcast Business email? Learn some tricks for resolving the most common issues.
Symantec, the Symantec Logo, the Checkmark Logo, and Norton, Norton 360 and Norton by Symantec are registered trademarks of Symantec Corporation ©2013 Symantec Corporation. All rights reserved. Microsoft product names and logos are trademarks or registered trademarks of Microsoft Corporation. All other trademarks are the property of their respective owners.