Hi Laura, list,
On Mar/06/2022, Laura Smith wrote: > I think the answer is in your question ? > > Prefix 188. vs prefix 166. ? I think that this part is how is supposed to be. Now with the full IP everywhere: root@mail:~# nslookup 188.39.73.166 166.73.39.188.in-addr.arpa name = mailcluster.zen.co.uk. (and other lines) I do realise that this one is not looking good: root@mail:~# nslookup mailcluster.zen.co.uk. Server: 127.0.0.11 Address: 127.0.0.11#53 Non-authoritative answer: Name: mailcluster.zen.co.uk Address: 212.23.3.121 Name: mailcluster.zen.co.uk Address: 212.23.6.67 If I do the same with a gmail.com IP: root@mail:~# nslookup 209.85.208.41 41.208.85.209.in-addr.arpa name = mail-ed1-f41.google.com. (and other lines) root@mail:~# nslookup mail-ed1-f41.google.com. Server: 127.0.0.11 Address: 127.0.0.11#53 Non-authoritative answer: Name: mail-ed1-f41.google.com Address: 209.85.208.41 Do you think that the error "Client host rejected: cannot find your hostname" is because the IP->hostname and hostname->IP lookups are not matching? I think that it should have written "Client host rejected: cannot find your reverse hostname" in this case. Thanks for any answers! (even if it's to make me check more things from a different point of view) -- Carles Pina i Estany https://carles.pina.cat
