[PrivacyBadger] Problem with privacybadger-request at eff.org?

[J.B. Nicholson-Owens]

I tried subscribing to this mailing list by replying to the confirmation 
email which came from privacybadger-request at eff.org but that address 
returned:

<privacybadger-request at eff.org>: host mail2.eff.org[173.239.79.204] 
said: 550
     Unrouteable address (in reply to RCPT TO command)

Could there be a problem on mail2.eff.org routing email to 
privacybadger-request?

Thanks for your help.