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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.
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