Engineering / ENG-1825
EU mail account: hard bounces don't reach identity-service
Description
Hard bounces from the EU account aren't marked on the person (ENG-1387): the bounce webhook is only set up on the US account. The bounce-rate alarm per account works; the per-person mark doesn't.
Set the webhook up on the EU account; the handler checks which account a bounce came from.
Webhook live on the EU account. Replayed 14 bounces from its log since 16 October.