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by autoreverse 5027 days ago
Not always.

Google's own google-content-api-for-shopping@googlegroups.com mailing list has this as the "To:" field:

google-content-api-for-shopping@googlegroups.com

And at the bottom of the message:

To unsubscribe from this group, send an empty message.

I had to ctrl-u and check the "Delivered-To:" and "X-Forwarded-For:" headers before I could unsubscribe.

(I'd tried to unsubscribe previously but the subscribed email account forwards to my main account so replying with an empty message didn't work. This thread prompted me to dig a little deeper and finally get one less piece of email per day - thanks HN!)