Adding Comcast Email to Mac Mail

I haven't migrated to the newer iMac yet, for a number of reasons. Not being able to set up Mac Mail didn't help. As I stated, this Mac Mail issue with Xfinity is not new, has been going on for years, and it's ridiculous that they're doing nothing about it.

Now, as of yesterday, not only can I not add my Comcast email account to the newer iMac, as I stated in my original post, I can no longer send emails through Mail. They sit in my outbox and go nowhere. I get this message: “can’t connect to the account “Comcast”. A popup window asks for my password, put the password in and get  "Unable to verify account name or password". In Mail under preferences/server settings, it shows Comcast is "offline". I'm receiving emails, but can't send. I can send through my (android) phone and tablet, and my email on Xfinity's site, but not through Mac Mail.

I just got off the phone with a tech person who couldn't figure out what the problem is. He gave me a number for Xfinity security. I'll call them tomorrow and hope they can help. In the meantime HELLO Xfinity, what is the freaking problem? There are threads going back several years about this. Why can't you fix this? What are we paying your very high rates for?

Sigh ... I'll report back if I get anything useful from security tech help.

@Lkpolo​ I did use an Icloud reload and my time machine, both should have been fine... but I had to re-add all my mail accounts.

Yes, I did ... as stated in my reply to Lkpolo. My password is not the issue. And please also note the newest issue I wrote about - no point in repeating it here. There is something seriously wrong with an issue that's been complained about for years now.

Must be nice to be a monopoly where it doesn't matter what your customers go through.

p.s. So no, my question has not been answered, and it wasn't answered in threads on the same issue from several years ago. There are also threads in Apple forums about this. DO SOMETHING.

What is this setting for, if it doesn't work?

For your iPhone or iPad, enter your email address then enter an incorrect password. The next screen that pops up should give you a choice between imap and  pop 3. That is where you enter your correct information, but for imap, your account name is your full email address. I’m not sure why it is like this now. It must be an iOS bug from the last big apple update. 

Thanks. The only Apple product I have is my iMac desktop. I don't have an iPhone or an iPad. My phone and tablet are Samsungs. As an aside, did you know that iPhones/iPads use many Samsung parts?

Anyway, I still can't add my Comcast email to my newer iMac, and I still can't send emails from Mail on my older iMac any more. Six days, and it appears that no one from Xfinity will come along and explain what the effing problem is.

Ask for advance security when you call. The out of country technicians you would usually get have no clue. I’ve been saying on here that there is a bug in the iOS software and the imap settings do not show up until you enter an incorrect password. Plus for the imap settings that you need for your iMac your user name is your entire email address.