What Is Comcast Outgoing Mail Server?

By Lisa M. McMahon

If you wish to download your Comcast email messages to your personal computer, you will need to know the settings for the incoming and outgoing mail servers. The incoming mail server allows you to download your email to your computer. The Comcast outgoing mail server receives email messages sent from your computer and directs them to the recipients. With the mail server settings, you can use any email client to receive and send email messages.


Simple Mail Transport Protocol (SMTP) is the Internet standard for sending electronic mail. Outgoing mail servers use SMTP to route email to the intended recipient. Most email messages have to travel through several servers before they reach their destinations; SMTP facilitates this process.

Mail Server Settings

In the account settings window for your email client, enter "mail.comcast.net" for the incoming mail server and "smtp.comcast.net" for the outgoing mail server. You must enter both in order to send and receive Comcast email.

Outgoing Server Additional Settings

Comcast's outgoing mail server requires authentication, so you must go into "More Settings" or "Advanced Settings" to enable this. You should also select "Use same settings as my incoming mail server" or similar wording.

Server Port Number

Comcast does not use the default server ports for its outgoing mail server. The default port for the outgoing mail server is 25 for most providers. Comcast, however, uses port 587. You will need to change this value in your email client under advanced settings or you will not be able to send email.