Thanks, for your helpful answers. I really appreciate it.
We do not use Outlook. We use Apple Mail on our Macs. The SMTP settings are all correct; domain is correct, everything. I have Comcast also at my home, using the same settings, same setup, but no problems sending mail. BTW, he can send email using his iCloud account with no problem.
All our staff working from home are all on Macs using Apple Mail. I have set up everyone's email settings correctly on all. Only one coworker is having this issue.
So Cisco is where to go from here?
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