Kai Schaetzl wrote:
Ted Mittelstaedt wrote on Mon, 11 Jan 2010 09:42:25 -0800:
This is the WRONG way to do this
It's the right way. The FP rate is almost zero and it encourages the few
offending ones to quickly add rDNS, really quick.
* The reason this is NOT mandated anywhere is because if it was then
sites running multiple mailing domains on a single server could easily
overflow the DNS UDP packet space with a list of PTR's for the server -
We are not talking about adding PTR for all domains, just for exactly
*one*. And that doesn't even need to resolve back and forth.
Clearly you fail to understand anything, here.
PTR's are not mandated because the standard has to apply to all sites,
both sites with multiple domains and sites without. It does not mean
that because it's not mandated that it's a bad idea to add a PTR record.
It simply means that sites WITHOUT a PTR are still fully compliant mailers.
The entire point of SA is to filter based on "fuzzy" logic, meaning
that the sender's mail is only wrong based on an arbitrary standard that
the person running SA pulls out of their ass. A "no PTR" rule is
EXACTLY the kind of fuzzy decision that SA is designed to make decisions
on. That is where that kind of rule belongs.
Your advice is kind of like the guy who puts a spoiler on a sports
car that is never driven faster than 100mph. The spoiler, Spamassassin
in this case, is an expensive, gas-mileage sucking "dunsel" that is only
there because of the bragging rights the guy gets by having it there,
it does absolutely nothing to help the car. In fact, anyone who knows
anything about fast cars, looks at the thing and thinks "how gay is
that?" and what a moron the idiot driving it is.
If you want to build a mailserver WITHOUT SA, then sure, go ahead and
add in rules like "no PTR" to the MTA - because you cannot do it any
other way.
But don't spend the money and CPU cycles putting SA on a mailserver
and then have it sit there doing nothing, like that spoiler on the
ass-end of a trans-am.
In other words, be a professional not a bozo!
Ted
