Holiday/out of office message

[Schwalbe, Oliver]

Hello Newsgroup,
 
i will implement a holiday/out of office message in my postfix.
the user should sent a message to holiday@<domain.de> and the 
holiday/out of office notification for the mailsender are active.
with a 2. mail to holiday@<domain.de> the notification will be inactive.
 
Can anybody help how to implement this?
Any other possibilities?
 
Kind regards
 
Oliver Schwalbe