We have an error with reporting subscriptions. The error is "The specified string is not in the form required for an e-mail address"
Validated the email addresses are valid
Validated the SMTP service name is correct
Checked DNS and the name resolves and pings
Checked rsreportserver.config and it has the correct SMTP server address
The To: email address is only to 1 recipient, so there is no other email address in the To: field
I wrote a small stand alone app that can test SMTP connections and will send an email. I copied the app to the SQL server and ran it. The app successfully connects to the SMTP server and sends an email. So I know it shouldn't be a firewall or port issue. And this also validated that the SMTP server address is correct.
Running MS SQL 2016 Enterprise v13.0.4001.0
Any help will be appreciated.