[Dovecot] antispam plugin: crm114 mode:"antispam signature not found"

Hi there,

I'm happily using dovecot, and today tried to integrate the antispam imap plugin to automatically train/inform the crm114 spam classifier when moving messages in and out of folder "SPAM"

However, when i try to move a message to folder spam, my client (Thunderbirds) says:

The current command did not succeed. The mail server responden: antispam signature not found.

Checking the source i found in signature.c

*signature_hdr = "X-DSPAM-Signature";

This appears to originate from the DSPAM support of the plugin and apparently doesn't find these header lines.

When using crm114 to sort spam there is no special header line. (or i didn't turn it on. do i _have_ to?)

how can i get that antispam plugin to work with crm114?

I'm using dovecot-1.0.10

TIA Peter Renner