[Dovecot] building a simple antispam plugin

[Alexander Prinsier]

Hello,

I'm trying to build another antispam plugin, but some things are a bit
unclear.

In backend_handle_mail I put store the signature returned from
signature_extract into my antispam_transaction_context. In
backend_commit it appears that the signature is empty. (It wasn't in
backend_handle_mail).

Somehow between backend_handle_mail en backend_commit it has been
cleared... When I use i_strdup it appears to work. Anyone can tell me
where this clearing happens? Is i_strdup the right way to do it then?

Thanks,
Alexander