using address-extensions for storing in special folders

[Stefan Palme]

Hi,

I have a cyrus imap server 2.2.12 behind a postfix server.
The postfix server rewrites incoming addresses according some
policy rules. The most common case is adding an address extension
to an email address, so kleiner at hora-obscura.de sometimes becomes
kleiner+internal at hora-obscura.de

Postfix delivers the emails to the local IMAP server via LMTP socket.

My question is: is there a way to configure the IMAP server, so that
mails to kleiner+internal at hora-obscura.de are automatically stored
in the INBOX/internal folder of user "kleiner"? 

I guess I can solve this with sieve, but is there a "native" feature
in the IMAP server doing this?

Thanks and regards
-stefan-


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