You should start off by setting up either a new Gmail or StartMail account. From either Gmail or Start Mail, you can configure either Gmail or StartMail to check the Comcast email account(Gmail) Or forward Comcast emails (StartMail). By doing so you will be able to utilize Gmail or Start Mail’s spam filtering service for the Comcast email.
At this point, you can decide whether or not to have your father ditch Comcast altogether.
Now you will want to log into the Comcast / Xfinity email portal and configure an auto-response that will let people that email him know that he has a new email address bestdad1@gmail or firstname.lastname@example.org
Comcast IMAP email server settings will be needed when you configure Gmail or StartMail to check the Comcast email.
Incoming Mail Server Name: imap.comcast.net
Incoming Mail Server Port Number: 993 with SSL ON
If the Mail Client lets you select an authentication method, choose STARTTLS.
If Needed: 143 with SSL ON
Outgoing Mail Server Name: smtp.comcast.net
Outgoing Mail Server Port Number: 587 (SMTP)
If Needed: 465 (SMTPS)
Encryption: TLS (use SSL if TLS isn’t shown.)
Authentication: Type in your Comcast username and password