RE: domain validation for e-mail addresses

You should probably only be validating the main DNS.. in your example that
would be ibm.com.

We have a domain, let's call it companya.com.  Now, I can send mail from my
as400, (as400.companya.com) to you and if you did a ping, you'd get nothing.

Don't mess with subdomains.  They're all handled by the main "domain"
system.

Brad

> -----Original Message-----
> From: Joel Fritz [mailto:JFritz@sharperimage.com]
> Sent: Thursday, September 07, 2000 11:54 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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