On 2/23/2015 10:33 AM, Charles Orth wrote: > Hi All, > > At this time, we're relying on extended error code 5.2.1 to drop the > connection.
I suppose you're referring to the 521 reply code. > We'd like to a more robust set of extended error codes (RFC5248) > which also drop the connection. Why? > Has there been any discussion on Postfix providing a new feature > where we can configure specific > extended status codes to drop the connection? No. Real mail servers may respond poorly to abrupt disconnections. Many will interpret a disconnect as a "lost connection" and retry the delivery again and again, turning a single rejection into hundreds. Get enough senders doing this and you effectively DOS yourself. It's generally safe to hang up on spambots. There's already support for that in postscreen and the rbl reject codes. -- Noel Jones
