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No Reverse DNS (PTR Record) on IP returns SMTP error "Protocol: SMTP, Server Response: '550 5.7.1 Fix reverse DNS for IP, or use your ISP server" |
Swift Internet, like many ISP's such as AOL refuse SMTP connections from mail servers which do not have a reverse DNS record (PTR record) on their IP address. Such refusals generate an SMTP error message: "Server Response: '550 5.7.1 Fix reverse DNS for IP, or use your ISP server'
Mail servers which do not have a PTR record on their IP address are misconfigured. To correct your problem, ask your ISP to add a PTR record to the IP address of your mailserver. The PTR record should match the Forward A record for the mailserver.
Reference:
RFC1912 Section 2.1 ( http://www.faqs.org/rfcs/rfc1912.html )
2.1 Inconsistent, Missing, or Bad Data
Every Internet-reachable host should have a name. The consequences
of this are becoming more and more obvious. Many services available
on the Internet will not talk to you if you aren't correctly
registered in the DNS.
Make sure your PTR and A records match. For every IP address, there
should be a matching PTR record in the in-addr.arpa domain.
AOL provide a Reverse DNS Record (PTR Record) checker at: http://postmaster.aol.com/tools/rdns.html
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