Leonardo Boselli wrote: > Some user had voicely complained me that one of thetir correspondent > (say [EMAIL PROTECTED] -fictitious-) has all his e-mail rejected. > I checked and turned that the server, that officially has the name > mail.ditchedserver.org, send this helo: > HELO ISCRA_domo.arsi > (and this name is the real one that send !) > > my exim 4.63 is unhappy and reject immediately the connection saying there > is an illegal (I suppose '_' )characther in helo name. > > This sound reasonably since all but that server that send with such headr > send malware. However these users are veri upset and do not accept that > our servve cannot accept such messages, while other servers in other > istitutions accept without problem. > > Then i ask: is possible to skip, for a certain source IP, and for a > certain set of recipient EVERY check, acceptin even the most malformed > message ? > > In alternative: can some one give me a link to some offical rule saying is > not acceptable sending Helo with underscores or non existant FQDN ? >
Hello quoting RFC2821 paragraph 4.1.2: In particular, the underscore character is not permitted. SMTP servers that receive a command in which invalid character codes have been employed, and for which there are no other reasons for rejection, MUST reject that command with a 501 response. If you wish to accept them, you can put in your config: helo_allow_chars = _
smime.p7s
Description: S/MIME Cryptographic Signature
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