Eddy Beliveau a écrit : > -------- Message original -------- > Sujet : Re: DSN: Improper sequence of commands in postfix 2.5.4 > De : wie...@porcupine.org (Wietse Venema) > Pour : Eddy Beliveau <eddy.beliv...@hec.ca> > Copie à : postfix-users@postfix.org > Date : 2009-02-13 12:19 > >> Eddy Beliveau: >>> Hi! >>> >>> I'm using Postfix 2.5.4 and it worked well. Thanks ;-) >>> >>> One of my academic user received this error message >>> >>> Google didn't help me much >>> >>> Do you know what can cause this failure ? >>> >>> Is it cause by my server ? >> >>> Reporting-MTA: dns;bay0-imc3-s4.bay0.hotmail.com >>> Received-From-MTA: dns;COl0-MC4-F43.Col0.hotmail.com >> >> Is your machine called COl0-MC4-F43.Col0.hotmail.com? >> >> Wietse >> > > Hi! Wietse, > > Many thanks for your reply. > > Of course not, this is not one of our servers. ;-) > > I was just wondering what is the cause of that "Improper sequence of > commands" reply. >
this generally means that the client and server got un-synchronized (client sends a command but server is not in the state to accept it). there are many cases when this could happen, either because of a bug in the client or the server, or in a proxy/firewall/router/... in the path between the two. > It seems that the problem is between CO10-MC4-F43.Col0.hotmail.com > and bay0-icm3-s4.bay0.hotmail.com > > If so, my server has nothing to do with it. > > Is there something that I can do on my end side to correct this behaviour ? > you can try finding if the messages that get such errors have something special. but that will be hard.
