Possible Duplicate:
Didn’t get notifications for Custodian badge
I earned 6x Custodian badges but didn't receive a notification for any. Is this a bug or by design?
Possible Duplicate:
Didn’t get notifications for Custodian badge
I earned 6x Custodian badges but didn't receive a notification for any. Is this a bug or by design?
Copying Kevin Montrose's answer on a similar question on Meta Programmers:
Most of the bronze badges don't notify users who are considered "veterans" of the network, which is (loosely) defined as having accounts on multiple non-meta sites.
The rationale is that getting a notification everytime you join a new site and, say, downvote gets a tad annoying after a while.
Custodian, being one of the "you did one thing"-bronze badges is one of those who's notifications are suppressed.
While I don't know what the exact criteria is, I'm certainly glad Geoff manually set IsVeteran on my account and I no longer get notifications for every silly bronze badge.