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Reply to: option not working?

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I am configuring TB to work with protonmail.com In the account settings I've specified the reply-to address, which is different from the protonmail.com address.

Yet when I send a message, the reply-to is still the protonmail address.

Could someone tell me what I'm doing wrong?

many thanks

I am configuring TB to work with protonmail.com In the account settings I've specified the reply-to address, which is different from the protonmail.com address. Yet when I send a message, the reply-to is still the protonmail address. Could someone tell me what I'm doing wrong? many thanks
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Arg, you're right, Protonmail is useless in this regard.

Does anyone know of a good secure ESP that configures with Thunderbird?

thanks