Cox blockingoutbound email on Thunderbird
I have Windows 10 / and Thunderbird 56b2 and PIA v72. Cox is my ISP. I have PIA DNS defined in my router. My options are:
Start application at logon is set to Y
auto-connect on launch is set to Y
show desktop notifications is set to Y
DNS leak protection is ON
IPV6 leak protection is ON
Data encryption is AES-256
Data Authentication is SHA-256
Handshake is RSA-2048
I am not blocking anything with my firewall.
No issues setting it up and using it for browsing. No issues with receiving email. The issue is when I attempt to send email from TB I receive a message - "An error occurred while sending mail: The mail server sent an incorrect greeting: eastrmimpo305.cox.net cox connection refused from 188.8.131.52."
I have to disconnect from PIA in order to send email and then reconnect.
I've tried messing around with the settings but nothing seems to help.
Is there a way around this?
Or is Cox simply blocking VPNs?