https://tools.ietf.org/html/rfc5321.html#section-2.3.5 Local aliases MUST NOT appear in any SMTP transaction. So correctly rejected, imo. just tell the other site the mail manager forgot to set the outgoing smtp connector in exchange. Happens so often.. Greetz,
Louis Van: domi...@timedicer.co.uk [mailto:owner-postfix-us...@postfix.org] Namens Dominic Raferd Verzonden: vrijdag 10 november 2017 15:30 Aan: Postfix users Onderwerp: Re: Helo rejected On 10 November 2017 at 14:08, Enrico Morelli <more...@cerm.unifi.it> wrote: my user don't receive mail from a real sender cause our mail server reject the Helo command: NOQUEUE: reject: RCPT from rrcs-70-60-37-220.central.biz.rr.com[70.60.37.220]: 450 4.7.1 <NTFYOHSrvNLES05.ntfy.local>: Helo command rejected: Host not found; from=<x...@xxx.xxx.xx> to=<x...@xxx.xxx.xx> proto=ESMTP helo=<NTFYOHSrvNLES05.ntfy.local> Nov 8 17:55:46 genio postfix/smtpd[3667]: disconnect from rrcs-70-60-37-220.central.biz.rr.com[70.60.37.220] ehlo=1 mail=1 rcpt=0/1 rset=1 quit=1 commands=4/5 Is there a way to receive these mails? ​You may be using this setting ​in one of your restriction lists: reject_unknown_helo_hostname. Remove this and you should be ok. I think there is not much point worrying about helo hostnames, they are easy to fake in any case. Better to focus on client reverse hostnames.
