Salut, with spammers the RFC SHOULD be read replacing SHOULD by MUST. Ce n'est pas obligatoire d'accepter l'email non plus ...
Thomas On 4 Apr 2013, at 10:57, Sylvain Rochet <grada...@gradator.net> wrote: > Salut Xavier, > > > On Thu, Apr 04, 2013 at 11:49:42AM +0200, Xavier Beaudouin wrote: >> Le 4 avr. 2013 à 11:37, Sylvain Rochet <grada...@gradator.net> a écrit : >>> >>> Humm, ça ce n'est pas dramatique, rien dans le protocole SMTP n'oblige >>> le HELO/EHLO. >> >> Si c'est une obligation, cf http://www.ietf.org/rfc/rfc2821.txt >> >> 3.2 Client Initiation >> >> Once the server has sent the welcoming message and the client has >> received it, the client normally sends the EHLO command to the > > "normally" != MUST > > >> server, indicating the client's identity. In addition to opening the >> session, use of EHLO indicates that the client is able to process >> service extensions and requests that the server provide a list of the >> extensions it supports. Older SMTP systems which are unable to >> support service extensions and contemporary clients which do not >> require service extensions in the mail session being initiated, MAY >> use HELO instead of EHLO. Servers MUST NOT return the extended > > "MAY use" != MUST > > >> EHLO-style response to a HELO command. For a particular connection >> attempt, if the server returns a "command not recognized" response to >> EHLO, the client SHOULD be able to fall back and send HELO. > > "SHOULD" != "MUST" > > >> In the EHLO command the host sending the command identifies itself; >> the command may be interpreted as saying "Hello, I am <domain>" (and, >> in the case of EHLO, "and I support service extension requests"). >> >> Après on peux avoir différentes interprétation du "client's identity", >> comme certains spammeurs ne font pas du travail propre, certains admin >> de mail insitent que HELO/EHLO <truc> représente le FQDN complet et >> propre de l'IP source et que sont reverse correspondent. > > Ce qui est tout aussi faux, il n'y a aucune restriction sur la chaîne > suivant le HELO/EHLO. > > > Sylvain --------------------------- Liste de diffusion du FRnOG http://www.frnog.org/
