Server says "(AUTH) Authentication failed" is msg when sending emails

Mail
1

Win 10
An error occurred.
“SMTP doesn’t support authentication”
Help.

2

Select another security policy in the account settings.
Try.

3

I tried all combinations of security policy. But, no change. When i tried “force use…” I got an additional error of incorrect settings.

4

Have you double-checked the required SMTP settings on your Mail Host site?

5

Yes. Comcast does not give specific instructions for settings for EM but does for other clients. For those most suggest using port 465 while one or two suggest port 587. I have tried both without success in correcting my problem.

6

I am a comcast/xfinity user.
For out going mail the server name should be: smtp.comcast.net
The recommended port : 587 (SMTP)
only if needed: 465 (SMTPS)
SSL encryption should be checked (ie on)

Maybe this will help. I do know that when I tried to activate emclient to xfinity inside a corporate firewall a few years ago (so I could get my personal emails easily while at work, not to use emclient for work) , the firewall blocked a number of ports which included blocking comcast send ports.