Send email via a secured port

Send outgoing email through a secured port on 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.

Configure your email client to send email through port 587*.

1. Go to your Internet Email Settings.
2. Under the Properties tab, select Servers.
3. If you are using a third-party domain/server, in the Outgoing mail (SMTP) field, type the webmail server name. If not, skip and go to Step 4.
4. Under the Outgoing Mail Server category, check the box for My server requires authentication.
5. Click the Settings button.

6. Outgoing mail servers:
   • If your outgoing mail server is the same as your incoming mail server, select the radio button for Use same settings as my incoming mail server.

• If you will be using an outgoing mail server that is different from your incoming mail server, select Log on using, and enter the correct Account name (email address) and Password for that account.

7. Click OK.

8. Go the Advanced tab and type 587 in the Outgoing mail (SMTP) field.
9. Click OK.

*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 Exchange and HMC Webmail users are not impacted if a block is placed on port 25.