Notifications you rely on are retried when the email fails and the inbox is off

Anyone can switch the in-app inbox off for a notification type in Settings → Notifications. For those people, the email is the only way the notification reaches them. Until now, if that email failed to send, the notification still counted as delivered and nobody found out.

Now a failed email to someone with In-app off counts as not delivered. A raised invoice, a gone-cold alert to a CSM or a new match for an expert is retried the way any other failed notification is. Someone who switched both channels off is still left alone: that was their choice.