Hi, this is the mlmmj program managing the mailinglist gentoo-server at gentoo.org To confirm you want the address ffmpeg-user at mplayerhq.hu added to this list, please send a reply to gentoo-server+confsub-108cfb363f4d71a-ffmpeg-user=mplayerhq.hu at gentoo.org This confirmation serves two purposes. It tests that mail can be sent to your address. Secondly it makes sure someone else did not try and subscribe your emailaddress without you wanting it. Your mailer probably automatically replies to the confirmation address, when you hit the reply button. The subject and the body of the mail can be anything.