I've been seeing this error for this one host. My first reaction was that the host was incorrectly configured, but the IP (92.103.176.37) reverse resolves to mail.mairie-carquefou.fr, which in turn resolves to that IP. In addition, the MX for mairie-carquefou.fr is mail.mairie-carquefou.fr (and mx3.mail.ovh.net). So I'm not really sure what the "host not found" is complaining about.
Jan 21 15:05:28 nantes-1 postfix/smtpd[6367]: connect from mail.mairie-carquefou.fr[92.103.176.37] Jan 21 15:05:29 nantes-1 postfix/smtpd[6367]: Anonymous TLS connection established from mail.mairie-carquefou.fr[92.103.176.37]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits) Jan 21 15:05:29 nantes-1 postfix/smtpd[6367]: NOQUEUE: reject: RCPT from mail.mairie-carquefou.fr[92.103.176.37]: 450 4.7.1 <SERVDMZMAIL.mairie-carquefou.fr>: Helo command rejected: Host not found; from=<direction.gener...@mairie-carquefou.fr> to=<x...@transport-nantes.com> proto=ESMTP helo=<SERVDMZMAIL.mairie-carquefou.fr> Jan 21 15:05:29 nantes-1 postfix/smtpd[6367]: disconnect from mail.mairie-carquefou.fr[92.103.176.37] ehlo=2 starttls=1 mail=1 rcpt=0/1 quit=1 commands=5/6 (I'm a bit confused about the SERVDMZMAIL in the helo. That host does appear not to exist.) Any suggestions what to look at / if I've likely misconfigured something? -- Jeff Abrahamson +33 6 24 40 01 57 +44 7920 594 255 http://p27.eu/jeff/ http://transport-nantes.com/
