Feature checklist of YouPS button

[soyapark]

See if both of us can implement following features and run on our email account to see any bug occured.

• Hide this email until thursday, then remind me about it

• If this person sends email while professor X is out of town, reply and
  tell them when professor X will be back

• If I don't get a reply to this email in 4 days, send a reminder
  inquiry to the recipient

• If email arrives from one of these 3 people, forward it to professor Z

• Hide any email from these people until the weekend: use see_later()