Hi,

It was a bit of a struggle, but I managed to set up a simple build environment in OpenBSD 
5.9 for creating OpenSMTPD filters.  I currently have a filter in beta quality that 
performs an SPF check using libspf2 and inserts a "Received-SPF:" header into 
the message.  Would the OpenSMTPD developers be interested in integrating such a program 
into the Extras package?

I am planning to build upon this to create a spammer-filter that resembles 
OpenBSD's spamd (in greylisting mode), but based on domain names (and also 
sender glob patterns).  Alas the filter API doesn't provide a direct way to 
'stutter' an entire conversation, though of course it is possible to pause on 
every callback event.  What do you think of the idea of a stutter mode in 
OpenSMTPD?

This spammer-filter needs an interface to a database where greylisting status 
is kept and where policies are kept.  For a filter program, what would you 
recommend for persistent storage?


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