Andrew McGlashan <andrew.mcglashan@affinityvision.com.au> writes:
On 21/08/2014 10:21 AM, Trent W. Buck wrote:
Jason White <jason@jasonjgw.net> writes:
Trent W. Buck <trentbuck@gmail.com> wrote:
These are all post-DATA. You should be rejecting as much as possible BEFORE then, using postscreen, a null MX, a tarpit MX, and so on.
I agree that this is preferable. I've also heard positive comments about grey-listing.
I currently use greylisting for 1s because my postfix version predates postscreen :-( The good folk of #postfix on Freenode told me (IIRC) that postscreen should obviate the need for greylisting.
We have to turn greylisting off for Telstra because they have a mail farm, and when postgrey says "try again later", they try from a different node in the farm and so get told "try again later" again.
There's a bunch of mail servers that do the same thing. You've got to whitelist Optus, Gmail and lots more....
Looks like I only do bigpond and optus, but gmail is included in the 100-ish list of exceptions that upstream already provided.