AVG VPN and Thunderbird email

Hi Mike,
Thank you for contacting AVG Community Support.
We are really sorry to know this. We'll certainly check and help you out.
When connected to AVG Secure VPN, you may experience problems while trying to send emails from an email client, such as Mozilla Thunderbird. Let me share you an article link to fix this. Please refer the article and configure the SMTP settings of Mozilla thunderbird as mentioned in it.
Troubleshooting for sending emails when connected via AVG Secure VPN (https://support.avg.com/SupportArticleView?l=en&urlName=troubleshoot-avg-secure-vpn-email&q=email&supportType=home)
Please let us know if it helped. 
Thank you and keep us updated.

My Thunderbird email client (on Windows 10 laptop) cannot send messages if AVG VPN is turned on. Error message:"Sending of the message failed.
An error occurred while sending mail: Outgoing server (SMTP) error. The server responded:  impout004.msg.chrl.nc.charter.net cmsmtp 191.96.80.94 blocked. Please see Spectrum.net for more information. AUP#Out-1130."
Solution is to turn off AVG VPN, which I do not want to do. Any ideas?

Hi Mike,
Thank you for contacting AVG Community Support.
We are really sorry to know this. We'll certainly check and help you out.
When connected to AVG Secure VPN, you may experience problems while trying to send emails from an email client, such as Mozilla Thunderbird. Let me share you an article link to fix this. Please refer the article and configure the SMTP settings of Mozilla thunderbird as mentioned in it.
Troubleshooting for sending emails when connected via AVG Secure VPN (https://support.avg.com/SupportArticleView?l=en&urlName=troubleshoot-avg-secure-vpn-email&q=email&supportType=home)
Please let us know if it helped. 
Thank you and keep us updated.