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I know this has been addressed before, but I just can't seem to find the answer.
I am getting unsubscribe requests from email addresses that are not in my database. I suspect that the email address I am sending to is forwarding to the email address that wants to unsubscribe. How do I find out if an email address I have recieved and unsubscribe request has come from a forwarded email?
To avoid this problem (particularly if the header is stripped out), I took a lesson fron Nigel and embedded the User ID and email address into the outgoing emails. This way the messages can be procesed even if forwarded.
Also, I've incorporated a best practice for subscription services and included a subscription control panel at the bottom of my outgoing emails. It includes the email address of the recipient (so that they can see which subscription address is coming to them - in case there is more than one being forwarded), their name, a link to a web based subscribe/unsubscribe page and an email address for complaints.
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I have a simple form (un subscribe) that imports the e-mail address that the mail was sent to and allows them to only need to use an image verification.
Then, if they want to change their user settings (subscription management), they can go to the other form which allows them to choose what newsletters they want.
Fooling with replies and headers is a waste of time.... unless you 'have' to.
MLK supports all kinds of auto processing and I've found it to be worth the time to set it up.