Such a configuration results in hostB never looking up any MX records because it recognizes mail to foo as local. But what should happen if hostB does not recognize foo as local .

The MX Lookup software simplifies the process of looking up a large number of MX records at once. The tool can be used to process large lists of email addresses or domain names.

It may be more what you're looking for? #include #include #include . looking up mx records If you've read all that and you still want to look up MX records, try the adns library, it .

5.1.2 - Bad destination host "DNS Hard Error looking up mydomain.com' (MX): . have checked dns at isp its no issue and i can see MX, nslookup records pointing .

So for whatever reason, Microsoft Exchange 2003 tries to send to the A record anyway, without looking up mx records looking up the MX record, since, I guess it's too expensive, and it receives:

Using DNSQuery() to get an MX record; Author: Dave Loeser; Updated: 28 Feb 2003; Section . opted to place unknown domains in the map to reduce // the time that I spend looking up .

do MX records work with IP addresses (instead of . Tutorials & FAQs: Domains: Setting up Domain Records . the first line as it is not a valid MX record entry. Looking .

If there are no MX records, use a default MX record of ``0 D.'' (Note that a temporary DNS failure looking up MX records does not necessarily mean ``no MX records'';
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