Milter-greylist

According to manu@...:
> 
> Last time I heard about that, I was given the following reason: 
> 
> regular mail prefer the primary MX, whereas spamware sends to any MX,
> regardless of the priority. This leads to ham/spam ratio being lower on
> secondary MX than on primary MX. But that does not mean spammers prefer
> secondary MX. 
> 
> Has this changed over the time? What's the purpose of targetting the
> secondary MX?

interesting questions.

My own experience is that it depends on the type of spam(mer)s. Some
prefer secondaries only, some prefer primaries, some try both.

Just had a look at one of my domains stats.
Around 75~80% hit the secondary MXs (and from those, only 10% max also
try the primary). The primary also get it's own load of (unique) spam
so I guess they are coming from different spam-tools.

And BTW, ~99.9% of the smtp cnx on the secondaries are spam, hopefully almost
all blocked.

My numbers (from m-greylist) may be a little bit off because I have so
many different anti-spam mechanisms running at the same time, some before
milter-greylist.

/Fabien