Sahil Tandon wrote, at 01/08/2009 10:06 PM: > James D. Parra wrote: > >> I am getting the following error when sending to the below mail server. I >> added the name of our internal relay server to our public dns and a ptr >> record, but I am still getting the error below. >> >> <snip> >> host mxi4p.craigslist.org[208.82.236.164] >> said: 554 5.7.1 <unknown[207.47.100.34]>: Client host rejected: rDNS/DNS >> validation failed. Please setup matching DNS and rDNS records:(in reply >> to RCPT TO command) >> <snip> >> >> Is there something else I need to add the postfix server? This is an >> internal mail relay server, behind a firewall and not accessible to the >> public. It only sends mail for our internal users and does not receive mail. > > % host 207.47.100.34 > 34.100.47.207.in-addr.arpa domain name pointer > 207.47.100.34.static.musicreports.com. > % host 207.47.100.34.static.musicreports.com > Host 207.47.100.34.static.musicreports.com not found: 3(NXDOMAIN) > ^^^^^^^^^^^^^^^^^^^^^^ > Fix that.
Or if your MX is also a relay, use that instead (either directly or as a smarthost for your internal relay): $ host musicreports.com musicreports.com mail is handled by 10 mail.musicreports.com. $ host mail.musicreports.com mail.musicreports.com has address 207.47.100.36 $ host 207.47.100.36 36.100.47.207.in-addr.arpa domain name pointer mail.musicreports.com.
