Re: domain validation for e-mail addresses

a dot to the left of the domain and everything else
left of that dot is not part of the registered domain.

So when looking up a domain like us.ibm.com you want
to strip off 'us.' before looking it up.


--- Joel Fritz <JFritz@sharperimage.com> wrote:
> 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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