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The The Restaurant at the Edge of the Universe, previously known as The Water Cooler, is a place to post stuff that has absolutely nothing at all to do with computers, broadband, Scot's Newsletter, or anything that's "supposed" to be here.
Thanks for the post but I have one question is ask...why in the world are you using your ISPs mail services?
I could get into a long rant about why doing so is a bad idea, but I am not going to ruin the post,
Maybe my months-long angst over this issue with Comcast email will help someone else in the future.
I've been unable to connect to my Comcast email account through Thunderbird for months. I've had to use Comcast's web mail. After a new install of OpenSuSE 15.1, I was setting up Thunderbird for other email providers and made a real effort to search for a solution for this problem. Finally, after discarding suggestions such as setting up the email account off-line (didn't work), changing the imap server to a rather suspicious server name or refreshing libnss (possible ramifications beyond my skill set) I found the solution.
Comcast doesn't support IPv6 at this time. Thunderbird's config file entry for network.dns.disableIPv6 has to be changed to true (default setting is false).