-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Sebastian Ries wrote: > Hi there > > I just want to know some opinions on the following DNS Setup for a mail > server: > > # host -t MX example.com > example.com mail is handled by 100 mail.example.com. > > # host mail.example.com > mail.example.com is an alias for hostname.example.com. > hostname.example.com has address 1.2.3.4 > > # host 1.2.3.4 > 4.3.2.1.in-addr.arpa domain name pointer hostname.example.com. > > The mailserver (postfix) connects saying it is hostname.example.com. > > > Should this be a correct setup?
It looks like CNAME error. See RFC 974 ;; > One partner we want to send mails to does BOUNCE mails with > 554 5.7.1 DNS Blacklisted by in-addr.arpa (in reply to MAIL FROM > command) > Do you think this is correct? > > I think this also prevents from getting mail from googlemail: > [EMAIL PROTECTED]:~$ host -t MX googlemail.com > googlemail.com mail is handled by 5 gmail-smtp-in.l.google.com. > googlemail.com mail is handled by 10 alt1.gmail-smtp-in.l.google.com. > googlemail.com mail is handled by 10 alt2.gmail-smtp-in.l.google.com. > googlemail.com mail is handled by 50 gsmtp147.google.com. > googlemail.com mail is handled by 50 gsmtp183.google.com. > [EMAIL PROTECTED]:~$ host gmail-smtp-in.l.google.com. > gmail-smtp-in.l.google.com has address 209.85.129.27 > gmail-smtp-in.l.google.com has address 209.85.129.114 > [EMAIL PROTECTED]:~$ host 209.85.129.27 > 27.129.85.209.in-addr.arpa domain name pointer fk-in-f27.google.com. > > Is this true? Google is true. That's basic rule of DNS ;; > Regards > Sebastian Ries > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (FreeBSD) iEYEARECAAYFAkkBS1kACgkQB00DNxnlnTarngCeI+GYTLl3iA0i/0p4xFEuiyor CYAAnApt9bzG2ng+MYmAmjHfphyJudBm =75AD -----END PGP SIGNATURE-----
