On Tue, May 17, 2011 at 1:17 PM, Wietse Venema <wie...@porcupine.org> wrote: >> 1. Your mailserver is attempting to communicate too soon within the >> SMTP transaction. Ensure that your sending server is RFC >> 5321-compliant, and is following the proper SMTP protocol standards. > > Amazingly, for the past two years Postfix has come with a feature > called postscreen that drops SMTP clients that speak to soon. I am > 100% certain that Postfix never makes that error itself. >
It totally baffled me. I have no idea how they came to that conclusion. Thanks for your tip on disabling the cache just for them.
