Nothing in the message headers, or on the Ritlabs forums Web site, suggests how to stop these messages from arriving (unsubscribing) or having them sent to another address.

(I have been on numerous mailing lists, but have never before had this problem.)

I tried deleting the group "Configuring the E-mail Client" from my list of subscribed forums. No effect.

I tried changing the email address in my profile. No effect.

What's the secret? And why is it so hard to figure out?