Re: Validating email addresses

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So how does one verify email, other than bounce back?

If I send email to david@midrange.com does it search every domain under
the sun until it finds one with an acceptable mx record?  If not, then
which domains does it search for mx records?

Rob Berendt
--
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
Benjamin Franklin




"David Gibbs" <dgibbs@mks.com>
Sent by: midrange-l-admin@midrange.com
04/25/2002 04:18 PM
Please respond to midrange-l


        To:     midrange-l@midrange.com
        cc:
        Fax to:
        Subject:        Re: Validating email addresses


<rob@dekko.com> wrote in message
OFE0CDEB20.253965C0-ON05256BA6.00733765@dekko-1">news:OFE0CDEB20.253965C0-ON05256BA6.00733765@dekko-1...
>  These people will have two addresses - a dekko.com
> address and a mountaincable.com address.  Still a ping to
> mountaincable.com should work, to my best guess.

Might, might not.  No specific corelation betwee the root domain name and
it's desginated mail receiver's ability to respond.

Perfect example: If John Ross's AS400 (the one that hosts midrange.com)
were
to go dark (I know, it's an AS400, they never go down), you could still
send
me email, as mail is being received by another system (just so happens to
be
linux.midrange.com).  In fact, if linux.midrange.com were to go dark, and
John's AS400 stays up, there is might be *NO* way to send me email because
the MX system isn't receiving it (that's not the case, as I'm about to
explain).

Additinoally, in the current configuration, both midrange.com and
linux.midrange.com could go dark and you could STILL send me email,
because
I have a backup MX that will receive and hold the mail.

Some backup MX's just hold the email for later delivery (mine delivers by
UUCP), but others are true mail system that a person would have to read
independantly.

> We are dealing primarily with businesses here.  How many businesses will
> have a ping fail with TCP3202, ( not TCP3210) yet still receive email at
> that domain?  I could be in for a rude shock but I'd like an example.

1. Anyone who outsources their email.
2. Anyone who has a backup MX

david




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