"5 mail servers each" More like several hundred, many cluster groups. They use load balancing so you really don't see the true number from a MX lookup.
Darin -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of DZ-Jay Sent: Thursday, May 08, 2008 9:07 AM To: ICS support mailing Subject: Re: [twsocket] mx lookup Wilfried Mestdagh wrote: > Hello, > > To find out which is the smtp server I have to send mail to for a > particular domain I can use the MXPreference[n] property of DnsQuery > component. But in what case there can be multiple results ? (I tryed a > few and get only 1 result 'answer#1 in demo program'). RFC specifies that entries can have multiple MX records with a preference number. The lower the value, the higher the preference. This is mostly used by large ISPs that have multiple hosts processing mail, for fault tolerance or load balancing. For example, AOL and Earthlink have about 5 mail servers each, all with their own MX record. dZ. -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
