DKIM Signing Module cache_key and cache_expiry options #85

Hi,

A DKIM signing guide document page references options named cache_key and cache_expiry listed in the performance section. I don't see any reference to these options anywhere else in the docs nor in the source code for the DKIM signing module. Is this section correct?

Also, the next section lists an option sign_inbound:

I see the ARC module has this option but does the DKIM signing module also have this option? I didn't see it listed in other DKIM signing module document pages or the default config file.

Thanks.