Email alert interface

[PesachZ]

Ability to subscribe to email alerts (using the bots email address). and notify the group/individual when a keyword is mentioned in an email from that sender. This would be used to monitor for emergency road closures in an area, and posted to regional group HO, or special closure HOs.

Use case: I subscribe the bot to an email alert system using ....wazebot+<username/groupname>@.... the bots email address with the username or gorup name in the address
anyone could sign up for a personal alert, admin could signup for a group alert specifying the from address.
when signed up for alerts, the bot will alert the specified HO when an email to thats groups email address (specified following the + in the address), from the address signed up.

Optionally the alert could include a keyword, so only emails from the registered address to the groups address, containing the keyword are sent to the HO.