[Request] Notification of mail

[katubug]

Is your feature request related to a problem? Please describe.

I and my users frequently forget to check our Snailboxes.

Describe the solution you'd like

A system similar to what Contact does, where you receive a chat notification if you're online when you receive mail. Additionally, the snailbox could have a visual indicator when it has mail (in case it arrives when you're offline).

[CreativeManul]

OH GODS! I really want this too! I support you! The little letter above the drawer in the Contact fashion is amazing, as is the cute sound.