Collect Senders Email Addresses From Specific Folder At Thunderbird : <p>as my title mentioned I am searching for a solution to get all email addresses that I have received from people and saved inside a certain folder in my Thunderbird. </p>

<p>I need them for marketing purposes, because those email addresses belong to people I have done business with.</p>

<p>Thanks for help.</p>

<p>Best
RS</p>
