RE: domain validation for e-mail addresses

The domain name is "WWW.IBM.COM" & "IBM.COM", then their internal DNS server
knows about the "US."  "US.IBM.COM" in not a public exchanged server.  On
your DNS server you can specify whither to publish and entry or not.  So
start removing the parts before the first "." If the lookup fails until you
only have one dot left.

Christopher K. Bipes    mailto:ChrisB@Cross-Check.com
Sr. Programmer/Analyst  mailto:Chris_Bipes@Yahoo.com
CrossCheck, Inc.        http://www.cross-check.com
6119 State Farm Drive   Phone: 707 586-0551 x 1102
Rohnert Park CA  94928  Fax: 707 586-1884

If consistency is the hobgoblin of little minds, only geniuses work here.
Karen Herbelin - Readers Digest 3/2000

-----Original Message-----
From: Joel Fritz [mailto:JFritz@sharperimage.com]
Sent: Thursday, September 07, 2000 9:54 AM
To: MIDRANGE-L@midrange. com (E-mail)
Subject: domain validation for e-mail addresses


I've just started playing with gethostbyname() in hopes of validating domain
names on e-mail addresses we've collected (with people's permission <g>).
These are mostly keyed in either by the customer on our web site or by
customer service people.  Strangely enough, the addresses are not always
valid.  We were hoping to correct the obvious typos and misspellings. 

I've been running a sweep over our master file checking the domains.  I've
noticed that some domains like us.ibm.com show up as invalid. Ping and
traceroute also give the same result.  Since us.ibm.com is something I've
seen a lot on this list, I'm curious how this gets resolved into the correct
domain name.  I notice on the internet headers from messages from people
whose address is @us.ibm.com that the domain part is a bit more complex than
it is in the from line.

TIA
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