Moderation emails are not always received. Sometimes announce mails are only delivered to some of subscribers. Filling in further details and CC'ing infra later (bedtime here).
Looks like a dup of bug #141904
Not sure wether it is related (just DUPE it if it is). The only issue lately is missing moderation email for GLSA 200609-07 with Message-Id: <200609131908.46834.jaervosz@gentoo.org>
no moderation mail received for GLSA 200610-02 sent using dev.gentoo.org at Wed, 04 Oct 2006 22:22:55 +0200 GLSA has just been resent to -announce only, hope it works now
ummm... reassinging to -infra i guess
*** This bug has been marked as a duplicate of 141904 ***