comcast email does not work with static IP address

I have an email account (@comcast.net) that is so old it used to be @adelphia.net .  I'd prefer to not have to give it up.  I'm never able to send email unless I turn on my vpn service (which masks my static IP).  Traveling, I've noticed sending email has not been a problem.  My IP at home is static from my ISP (which is not xfinity) and I have it for server access for work.  Evidently, Xfinity does not want to allow sending email through 3rd party software (in this case MS Outlook).  Is there a way to have my static IP whitelisted so Outlook will work with my comcast.net email?