Setup outgoing server for Thunderbird

Since Comcast/Xfinity stopped issuing Comcast.net email addresses 18 months ago, you'll need to go elsewhere for email service. If your webhost offers email service your might go there. Otherwise, Gmail.com, Yahoo.com, and Outlook.com (and others) offer basic email service at no charge. Once you pick a provider, follow their instructions for setting up and using your email. 

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@user_ie85mh 

I have an email account related to my website that uses Thunderbird.  I am a newcomer to Xfinity and us newbies cannot get an Xfinity/comcast email address.  So how do I setup my outgoing server for my website email account?

Your webhost, or whomever you have your email account with, should have that listed somewhere on their website.

Did you set up your website in the 90s?  I remember back then when open relays were a big problem and many webhosts would tell you to use something else for SMTP.  Back then something else was typically your ISP.

Somewhere in the late 90s/early 2000s, SMTP AUTH came along and it became safe for webhosts to run SMTP again.  Even before that, some offered kludges like: POP before SMTP, where authenticating to POP whitelisted your IP address for SMTP for a while.

I’d say check with your webhost again.  If they really still have nothing, start looking at email providers that do POP and SMTP.  Study up on DMARC while you’re at it.  Running your domain email through someone else is getting trickier than it used to be.