Does Anyone Understand This???

[juergen]

yes, one not so dodgy reason to do that would be to confirm an email address is correct.

The on posted in the first message was:
-------------
......./autoadd/?c=7075 - Required beginning of every hidden image url
email=address%40domain.com - URL encoded email address of the person to subscribe
lid=1 - ID of the list to subscribe the email address above to
-------------

That one does not sound like just a confirmation.

[pauland]

yes, one not so dodgy reason to do that would be to confirm an email address is correct.

The on posted in the first message was:
-------------
......./autoadd/?c=7075 - Required beginning of every hidden image url
email=address%40domain.com - URL encoded email address of the person to subscribe
lid=1 - ID of the list to subscribe the email address above to
-------------

That one does not sound like just a confirmation.

No, you are right. A legitimate subscription option would have a link for the user to click. That link could also pass the users details for subscription, but that would all be visible and at the users discretion. There's no need to use hidden images to subscribe someone.