Milter-greylist

> In order to avoid that and make the change acceptable, it needs to be a
> generalization of lazyaw. The configuration option is just a flag for now, it
> could get a set of values to consider:
>   lazyaw addr            (équivalent to lazya without argument)
>   lazyaw addr rcpt     (what you ware looking for)
> 

I would not touch the old good lazyaw option.
Rather add the following extension to both racl and dacl greylist statement:

racl gerylist [lazyawaddr] [lazyawfrom] [lazyawrcpt] ...

That way there is higher flexibility of controlling what should be checked
depending which greylist ACL match generated the whitelist entry.

Defaulting for the compatibility:

If the old good lazyaw option is off, than the traditional greylist entry should be interpreted as before.
If the old good lazyaw option is on, than the traditional greylist entry should be read as
racl greylist lazyawfrom lazyawrctp ...
(No lazyawaddr on!)

For the requirement of Mauricio:
racl greylist lazyawrcpt
only, without lazyawfrom (both sender address and IP matters for AW comparison)

By the way interesting option would be:
racl greylist lazyawfrom lazyawrcpt
If one given sender sent an e-mail successfully to one given recipient,
than no matter from which IP next time (s)he tries to send, it will be no subject of greylisting.

There should be checking that not all the three new options to be on at the same time,
since that would effectively switches off the greylisting.

That may affect the dump file format, has to be checked.