PHP VerifyMail is a developing class designed to prevent automatic registrations based on entering regexp-valid but not existent mail domain. It uses DNS and SYN to check mx server existance. Based on Net_DNS from PEAR, used as a basic "includes".
A simple DNS analysis tool providing both IPv4 & IPv6 queries for A, NS, CNAME, SOA, MB, MG, MR, NULL, WKS, PTR, HINFO, MINFO, MX, TXT, AAAA, DS, RRSIG, NSEC, DNSKEY records. Also provides authorithy check and DNSSEC support.
C# DNS Client Library (100% managed code). Query domains to get MX records, CNAME and Address resource records from your application. All common DNS query types supported. Supports user-defined servers.
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perl-dyndns is project to provide cross platform (Win, Mac, Linux) solution for DHCP ISP-connected users, that can obtain permanent DNS, MX and webhosting service for http://www.dyndns.org/. PROJECT MOVED. See Github user jaalto.
A DNS resolver library written in pure PHP script. This library offers almost same functionalities of getmxrr() and checkdnsrr(). You may find this library helpful when you would like to retrieve MX(Mail exchange) records in win32 PHP environment.