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You can't. It is a part of the system and eventually those email addresses will drop off the list completely.
Need Email Help? Please post the following information in your post.
Do you use XfinityConnect? The Full or Lite version?
Do you use an email client? Which one? (Eg; Windows Live mail, Outlook, a smartphone etc.)
Which browser/version do you use? And- have you cleared your browser cache?
Which operating system? XP, Vista, Windows 7, Mac OS X
Details of the problem you are having.
I use Xfinity Full---- Email Client??-not sure Windows, I believe. I'm NOW using Windows 10 and that's when all these names flooded my email list. (The list you get when you want to send an email and you press "To")
I'm using Internet Explorer as my browser. The cache is clear.
Hope this helps.
When you click on the "To:" button, the list you see is part of the auto-fill function of the email program. The auto-complete feature in the Comcast address book has it's own memory. You can't access it or alter it. Periodically Comcast will re-set accounts, and at that time entries that have been deleted from your address book should vanish. However, they only do that sporadically, on no particular schedule. So those old addresses could keep popping up for quite a while.
Also, when you type an address into the To: Cc: or Bcc: fields, the feature will remember it if you actually send an email to that address, even if it’s not in the address book.
Are the names people that you have sent emails to before, even if not in the address book?
The age doesn't matter. This is a common feature in almost any webmail program I know of. If you use an address in the To: field and actually send an email to it, it will remember it even if it's not in your address book.