Mailing lists subscription functions broken.

As reported in #meta by @westonruter:

It seems like the wp-svn and wp-trac mailing lists aren’t working for new subscriptions. I’ve also tried unsubscribing an old email but I was unsuccessful. (edited)

I’ve verified the behaviour that new subscriptions appear not to generate any emails, either subscription confirmation or notifications from TracTrac Trac is the place where contributors create issues for bugs or feature requests much like GitHub.https://core.trac.wordpress.org/. (I sub’d a ...@hulse.com.au email to wp-trac, and verified with Google Email Log search)

#prio2 #lists #email