On 21/01/2021 15:31, Richard wrote: >> Date: Thursday, January 21, 2021 15:24:10 +0100 >> From: "Herbert J. Skuhra" <herb...@gojira.at> >> >> On Thu, Jan 21, 2021 at 03:15:24PM +0100, Jeff Abrahamson wrote: >>> 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? >> http://www.postfix.org/postconf.5.html#smtpd_helo_restrictions >> >> reject_unknown_helo_hostname (with Postfix < 2.3: >> reject_unknown_hostname) Reject the request when the HELO or >> EHLO hostname has no DNS A or MX record. > ... and your HELO is from: > > 450 4.7.1 <SERVDMZMAIL.mairie-carquefou.fr>: > Helo command rejected: Host not found; > > which doesn't appear to resolve.
OK, thanks, that's what I'd tentatively concluded, but it's a kind of big ISP (OVH), so I have to at least ask myself if I've misunderstood before being too convinced that they've misconfigured their DNS. -- Jeff Abrahamson +33 6 24 40 01 57 +44 7920 594 255 http://p27.eu/jeff/ http://transport-nantes.com/
