Milter-greylist

We've noticed that over time (and in our configuration), the memory
consumption of milter-greylist has grown to over 400 MB per server instance.
It would seem from a quick code scan, that this is mainly the result of the
sizeof(struct rcpt) (defined in milter-greylist.h).

struct rcpt {
        char r_addr[ADDRLEN + 1];
        LIST_ENTRY(rcpt) r_list;
};

The ADDRLEN macro is defined in dump.h and based on RFC-2821, it is set to a
value of 324.   Our database is 2.2 million entries, which is why I believe
we're consuming in the area of 400 MB.

I would like to reduce the memory footprint of milter-greylist.

In the long run, perhaps the best approach is to refactor the code to use a
char* for r_addr, and malloc() new entries based on the actual length of the
address.

But as a quick hack, I'm considering just dropping ADDRLEN to 100. 

Does anyone know whether this would break anything too severely?

Thanks
Jim C.