Can't send email from comcast.net email accounts

[shutoutinseattl]

I am using Outlook 365 home for my email. Over the past couple of weeks I have been having trouble sending emails from 2 comcast.net email accounts. This is the message I get when sending:

[shutoutinseattl]

Thinngs I have tried:

1. logging into comcast.net email and successfully sending mail.

2. Deleting the email account in Outlook and recreating. (recreating fails)

3. Creating a new profile in Outlook and adding email accounts to it. (no change)

Any ideas?

[shutoutinseattl]

Turns out the problem was the PIA VPN I use. When I turned t off, email worked OK. Kind of a pain, but it works