Re: [MacPerl] Verifying email addresses

[John W Baxter <jwblist@olympus.net>]

At 18:28 -0500 8/4/2000, Andy Berkvam wrote:
>  So while you can probably assume that any addresses that fail this check
>are invalid, you can not assume that addresses that pass this check are
>valid.

You can't even assume that a failed address is invalid:  it is possible to
configure the Exim MTA (at least) so that for messages from hosts which are
blocked from sending for some reason, an unknown user sort of response is
returned.  [Doing so <should> end the attempts, whereas failing to respond
at all just causes the sender to try again later, where in some cases
"later" is several times a minute.]

So, if you did your testing from, for example, a machine with an IP on Paul
Vixie's DUL list (dialup IPs) and the receiving machine uses the DUL and is
configured like that, you would find all addresses in such a domain to be
invalid.

   --John
-- 
John Baxter   jwblist@olympus.net      Port Ludlow, WA, USA

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