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Question: High Sierra upgrade

iMac: macOS Sierra 10.12.6

The Sierra upgrade broke the synch between my apple mail account and my comcast email account. I can create a message in my comcast mail and it will show up in apple mail as well. But I can not do the reverse. This has happened only today since I upgraded Sierra. What do I need to do?

iMac, macOS Sierra (10.12.6)

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User profile for user: globalworld

Question: High Sierra upgrade