Postpone email delivery with LMTP and Postfix

[Miloslav Hůla]

Hi,

is there any way, based on userdb/passwdb attribute, how to postpone an 
email delivery? The purpose is, I need to freeze an account (Maildir++) 
for a few minutes and new email must not be delivered. But emails must 
be delivered when account is unfrozen.

I found few things about Postfix filters, but I'm not sure it's a good way.

Thank you, Milo