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Does your unsubscribe process work? Are you sure?

• steve
• Best practices

I stumbled across an interesting problem today.
A company I bought something from a while back added me to their newsletter. They seem to be having trouble making sales this quarter, as they’ve gone from an occasional email every few weeks to bombarding me with increasingly desperate offers in the past week or two. So I do what most recipients do in that situation (well, the ones who don’t just mark the mail as spam, anyway). I click the unsubscribe link.
I get a perfectly normal, standard unsubscription page, with a nice, prominent “Unsubscribe from all” button with good text explaining that that will remove me from all of the companies mailing lists. No requirements to log in, set dozens of checkboxes or provide a password I don’t have. So far this is a textbook example of a good unsubscription process.
I click the button. Nothing happens. That’s not good.
So I grab one of the people I know over at that ESP and we start looking at it. He clicks the button, and it loads a new page saying that I’ve been unsubscribed from all of the companies mailing lists.
A bit more testing shows that the unsubscription works if you use Internet Explorer or Firefox, but not if you use Safari. The cause of the bug was threefold: