This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

How do I change the SMTP port number?

more options

Using the current version of FF with Windows 7, information from Comcast suggests changing the SMTP port to either 435 or 587.

Using the current version of FF with Windows 7, information from Comcast suggests changing the SMTP port to either 435 or 587.

All Replies (1)

more options

SMTP is related to email services, not to a web browser such as Firefox.