Hi when I send a email to craiglist i get this error message host mxi5s.craigslist.org[66.150.243.12] said: 554 <unknown[75.145.21.249]>: Client host rejected: rDNS/DNS validation failed. Please setup matching DNS and rDNS records: But I had my isp comcast make ptr records for my mail server server1.opnwireless.net I used dnsstuff to test my ptr record an it says it works PASS Reverse DNS entries for MX records OK. The IPs of all of your mail server(s) have reverse DNS (PTR) entries. RFC1912 2.1 says you should have a reverse DNS for all your mail servers. It is strongly urged that you have them, as many mailservers will not accept mail from mailservers with no reverse DNS entry. Note that this information is cached, so if you changed it recently, it will not be reflected here (see the www.DNSstuff.com Reverse DNS Tool for the current data). The reverse DNS entries are: 252.21.145.75.in-addr.arpa server1.opnwireless.net. [TTL=3600] So Im stuck and dont know what to do
Your rdns is setup for ip x.x.x.252 "server1.opnwireless.net" not ip x.x.x.249 from which your mail server seems to be sending from.
