Keep option to write new mail to same sender
The following feature should not be lost: when opening a received email, we have the option to reply to it, but if we want to send a new one with a different subject to the same sender, it is easy. You just have to click on the header of the received email, where the sender's address appears, and a small modal window with the contact details and their email address will automatically open. By clicking again on the email address, a new tab opens to send a new message with a new subject to that sender, thus avoiding manually typing their address. I tried this on the new Yahoo, but the feature is no longer there; hopefully they will keep it, please.
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