I cannot send emails from my laptop running Windows 10 Pro, using Thunderbird 102.9.1 on charter.net
I use Thunderbird 102.9.1 (32-bit). On afternoon of March 30, 2023, I lost the ability to "Send" messages. When I hit "send", the small box comes up, the blue bar goes all the way across the screen...and, freezes there. I have conferred with my source ISP at "charter.net" (company name is Spectrum) in Michigan (we are Snowbirds) and with the local ISP several times and they seem to not know what the problem is. The ISP has not been able to get my laptop back up with sending.
When I try to "send" I also eventually get this error message:
"An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: impout007.msg.chrl.nc.charter.net cmsmtp 22.214.171.124 blocked. Please see https://www.spectrum.net/support/internet/understanding-email-error-codes
for more information. AUP#Out-1130."
That error code says: "The IP address you’re trying to connect from has an issue with the Domain Name System. Spectrum requires a full circle DNS for emails to be allowed through. Verify the IP you’re connecting from, and check the IP address to ensure a reverse DNS entry exists for the IP. If the IP address is a Spectrum-provided email address, contact us."
My firewall is Windows Security that comes with Windows 10 Pro; my Anti-Virus software is Malwarebytes Premium 4.5.25; Operating System is Windows 10 Pro v. 22H2; and, my Email Client is Thunderbird 102.9.1 (32-bit).
Any help out there?