Checking Email and DNS MX records in ColdFusion with Java DnsContextFactory and Google Public DNS


Nice short function using Google's DNS and Java DnsContextFactory. Based on a script I saw here

Note; a trailing space fails here; so make sure that doesn't waste some time of your day when validating.






<cffunction name="validateEmailAndMXRecord" returntype="Struct"> 
    <cfargument name="emailAddress" required="true">
    <cfargument name="checkMXRecord" required="false" default="true">

    <cfscript>
    var env = CreateObject("java", "java.util.Hashtable");
    var dirContext = CreateObject("java", "javax.naming.directory.InitialDirContext");
    var type = ArrayNew(1);
    var attributes = "";
    var atribEnum = "";
    var stReturn = StructNew();
    </cfscript>

    <cfif isvalid("email", arguments.emailAddress)><!--- basic validation (possibly not good to rely on this.) --->
        <cfscript>
        env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
        env.put("java.naming.provider.url", "dns://8.8.8.8"); // Using Googles Public DNS
        env.put("com.sun.jndi.dns.timeout.initial", "2000");
        env.put("com.sun.jndi.dns.timeout.retries", "3");
   
        dirContext.init(env);
       
        type[1] = "MX";
        type[2] = "NS";
        type[3] = "A";
       
        stReturn.email = arguments.emailAddress;
        stReturn.diagnostics = StructNew();
        </cfscript>
        <cftry>
            <cfscript>
            attributes = dirContext.getAttributes(listgetat(arguments.emailaddress, "2", "@"), type);
            atribEnum = attributes.getAll();
            stReturn.validMX = 0;// will be overwritten if found
            </cfscript>
            <cfloop condition="#atribEnum.hasMore()#">
                <cfscript>
                attribute = atribEnum.next();
                stReturn.validEmail = 1;
                if(listfirst(attribute.toString(), ":") eq "MX"){
                    stReturn.validMX = 1;// will be overwritten if found
                }
                stReturn.diagnostics[listfirst(attribute.toString(), ":")] = listlast(attribute.toString(), ":");
                stReturn.message = "Email Ok";
                </cfscript>
            </cfloop>
            <cfcatch type="any">
                <cfscript>
                stReturn.email = arguments.emailAddress;
                stReturn.validEmail = 1;
                stReturn.validMX = 0;
                stReturn.message = cfcatch.message;
                </cfscript>
            </cfcatch>
        </cftry>
    <cfelse>
        <cfscript>
        stReturn.email = arguments.emailAddress;
        stReturn.validEmail = 0;
        stReturn.validMX = -1;
        stReturn.diagnostics = StructNew();
        stReturn.message = "Invalid Email Pattern";
        </cfscript>
    </cfif>
    <cfreturn stReturn>
</cffunction>

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