On Thu, 1 Dec 2022 at 16:59, Matus UHLAR - fantomas <uh...@fantomas.sk> wrote:
> >> On 01.12.22 15:23, David Dolan wrote: > >> >We have two customers who we're unable to receive email from. > >> >It's failing the helo lookup as it can't resolve the hostname in the > helo > >> >message. > >> >Helo command rejected: Host not found; > > >On Thu, 1 Dec 2022 at 15:49, Matus UHLAR - fantomas <uh...@fantomas.sk> > >wrote: > >> The issued hostname is logged just prior to this text. > >> You skipped the most impotant info here. > > On 01.12.22 16:06, David Dolan wrote: > >NOQUEUE: reject: RCPT from unknown[103.246.251.109]: 450 4.7.1 < > >wx-use2.prod.hydra.sophos.com>: Helo command rejected: Host not found; > >from=<#############> to=<#############> proto=ESMTP helo=< > >wx-use2.prod.hydra.sophos.com> > > strange, wx-use2.prod.hydra.sophos.com is resolvable from here, although > it > has 33 records. > > Don't you run private DNS containing domain sophos.com or > any its subdomains? > > We don't have dns for any of the sophos.com. It also resolves from our mail relays as you see where it returns 33 addresses. That's why we thought it may be an issue with the number of addresses returned? > > -- > Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ > Warning: I wish NOT to receive e-mail advertising to this address. > Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. > How does cat play with mouse? cat /dev/mouse >
