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  1.  Home
  2. WEB400
  3. January 2006

DNS Lookups

I am using a small PHP program to perform validation on e-mail domain names
using gethostbyname.

I found that some domains (e.g. xyz.com) gave false fails, so I adapted the
program to also try mail.xxx.xxx.  I'm still seeing failures on some
addresses that are supposed to be good.  Any ideas on what else to check?

Reason I need this is that sometimes I have to operate using an ISP that
rejects all recipients if any one of them fails a DNS lookup.  They don't
tell you _which_ one - so it can be a royal pain trying to isolate the
problem address.

Jon Paris
Partner400

www.Partner400.com
www.RPGWorld.com

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