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"Reply To" in the composition window does not work in Thunderbird 68.9.0

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I am ready to compose a new message. I address the message to a group and since I want the response to go to a different person, I enter the person's email in "Reply To" option. Thunderbird won't let me send the message. I have used the feature in the past for years. Is there is a fix to the problem?

Thanks in advance.

Not computer savvy

I am ready to compose a new message. I address the message to a group and since I want the response to go to a different person, I enter the person's email in "Reply To" option. Thunderbird won't let me send the message. I have used the feature in the past for years. Is there is a fix to the problem? Thanks in advance. Not computer savvy

Saafara biñ tànn

It's not a TB issue, as some mail providers may allow non-registered Reply-to addresses, and some may not.

https://support.mozilla.org/en-US/questions/1260352

https://support.mozilla.org/en-US/questions/1270491

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What error message do you receive when Thunderbird refuses to send the message?

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It gives me the following error message. An error occurred while sending mail. The mail server responded: Request failed; Mailbox unavailable. Please check the message and try again.

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This problem came up some time ago with AT&T accounts. The issue was that the Reply-to address wasn't an AT&T account already in TB or designated as an 'authorized' address in the sending account's webmail settings. This makes sense, that you can't specify a Reply-to address that you don't 'own'.

If you can't add the account in the Reply-to field, add a line in the message body such as 'Please direct all replies to abcd@example.org'.

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Thanks; at least I now know what the issue is. I suppose i just have to live with it. Ideally, TB design team should fix the problem.

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Saafara yiñ Tànn

It's not a TB issue, as some mail providers may allow non-registered Reply-to addresses, and some may not.

https://support.mozilla.org/en-US/questions/1260352

https://support.mozilla.org/en-US/questions/1270491

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Thank you very much for your help.