[Mailman-Users] new subscriber pending notification not going out to list admin

Hello all,

I have a list admin who tells me that sometimes notifications of
pending subscriptions aren't going out to him. I had reason to doubt
him, but he has just sent me an example of a pending registration from
yesterday by jenny_zhaochin@[redacted].com and I had a look in the
logs:

$ sudo -u mailman ./list_admins midfex
List: midfex, Owners: sherwindu@[redacted].net
$ grep -B 30 -A 30 jenny_zhaochin /var/log/maillog |grep -i sherwin
$ grep "jenny_zhaochin.*250 ok" /var/log/maillog
Jun 14 21:42:12 [redacted] postfix/smtp[4475]: C069C4C021: to=<jenny_zhaochin@[redacted].com>, relay=[redacted], delay=1, status=sent (250 ok dirdel)

Any ideas?

Cheers,