Does it look like the user is getting unsubscribed ?

https://meta.wikimedia.org/w/index.php?title=User_talk:Peteforsyth&oldid=15468060#e-mail_won.E2.80.99t_function

I copied my address from the preferences, I could find it dozens of times in my mailbox. I nullified my e‐mail address, then readded it, e‐mailed myself, and rereceived nothing. I tried using Internet Explorer instead of Opera… nada. Then when I returned, I received a new message. I returned to the mailbox. ‘Your email address has now been confirmed.’ Sent another e‐mail to myself. Nada. And I’ve checked the spam box multiple times. Oh, and I just rereceived that unsubscription notice.
I just now sent you a test mail. Oh wait, it unsubscribed me again. I sent you another mail, this time sans requesting a personal copy. Bloody hell. --Romanophile ♞ (contributions) 02:40, 23 March 2016 (UTC)

In T130723#2144880, @01tonythomas wrote:

Does it look like the user is getting unsubscribed ?

Who could answer this?

They've got a yahoo email. Which are notoriously unreliable with emails from WMF

Yup, 5 bounces and unsubscribed

archive/BounceHandler.log-20160327.gz:subject: Mail delivery failed: returning message to sender

Ping T58414, T134886 and T71626