On Tue, 2004-08-03 at 14:46, Steve Prior wrote:
One of the nice things about greylisting is you don't receive the data
portion of the message. (at least in most implementations). All you
get is the IP address of the MTA, sender, and recipient. That
information forms a tuple that is stored in the database. The remote
MTA is then told to come back later. Currently you can set this to just
a few minutes. Most legit MTAs will retry within 5 minutes or so. As
such most legit email that has not already been whitelisted will not be
delayed very long.
What is annoying is the server that either do not try at all or retry with forged return addresses (unique invlaid addresses which, yes, I consider forged). Servers like yahoogroups (which really, should be kicked off the planet anyway, but that's not my call) which will never retry a message or amazon.com which uses a different forged return every time.
I was also seeing spam with multiple random guessed recipients.
Greylisting has eliminated those as well as 98 to 99% of the spam I was
getting. The rest spamassassin handles. I don't think the email server
has been idle like this in a long time. :)
The only servers I am whitelisting from greylist are amazon and yahoogroups because really, I have no choice. But it is frustrating when large companies cannot behave properly.
--
"He sees the good in every one. No one would ever take him for a clergyman." Lucy Honeychurch
