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Sending email to Gmail accounts

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I keep getting "Undelivered Mail Returned to Sender" messages when sending emails from Thunderbird to Gmail accounts. Can you help? I am using Thunderbird 102.11.2 (32-bit) as POP mail server with email account through pairserver.com (SSL/TSL with normal password). I can send to Gmail accounts with no trouble directly from webmail.pair.com.

I keep getting "Undelivered Mail Returned to Sender" messages when sending emails from Thunderbird to Gmail accounts. Can you help? I am using Thunderbird 102.11.2 (32-bit) as POP mail server with email account through pairserver.com (SSL/TSL with normal password). I can send to Gmail accounts with no trouble directly from webmail.pair.com.

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Is that the complete message? If there is more content, that may help. It may be that the sending IP is blacklisted, as your IP is different from your web host.

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Is that the complete message? If there is more content, that may help. It may be that the sending IP is blacklisted, as your IP is different from your web host.

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Thanks. I read the message more closely after receiving your reply, and I think it was an authentication issue. Seems to be working now.

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My son seems to have found a solution. This is part of his email

"The tag has been added onto the DNS" and further "it's a known change google did".

I don't understand but the fix seems to work. Good luck out there.