Virtual emails at login

[Marten Lehmann]

Hello,

I known several ISPs that are generating virtual emails when I'm logging 
in into my email account.

Example:

web.de (a German freemail service) allows freemail users to login 
through pop3 only once in 5 minutes (while you can login as often as you 
want through the webmail interface). If I'm logging in more often, I get 
a message that appears as a usual email, informing me that I can only 
login once in 5 minutes and that I have exceeded this limit. No matter 
if I'm deleting it or if I don't: If I'm logging in after 5 minutes it 
has disappeared.

Other example:

I want to inform my users of new spam mails with an email listing all 
the subjects of the spam detected mails. I don't want to generate this 
email once a day, because if the user doesn't login everey day, he gets 
several of these emails at once. I want to generate it just in time once 
the user logins in.

I wonder how this could be done with Cyrus? Does a suitable solution 
already exist?

Regards
Marten