When you set up a new Comcast email ID, it will work with POP and IMAP. Which one is used depends on the program, app, or device you use to retrieve your mail. To change it, see https://www.google.com/search?q=outlook+email+change+from+IMAP+to+POP3 and the POP Access settings from https://www.xfinity.com/support/internet/email-client-programs-with-xfinity-email/.
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