----- Original Message -----
From: "Oki DZ" <[EMAIL PROTECTED]>
> BTW, recently I had a user that sent an email to <username>@hotmail.com.
> HotMail's DNS entries are set as follows:
> hotmail.com preference = 10, mail exchanger = mc1.law5.hotmail.com
> hotmail.com preference = 10, mail exchanger = mc2.law5.hotmail.com
> hotmail.com preference = 10, mail exchanger = mc1.law13.hotmail.com
> hotmail.com preference = 10, mail exchanger = mc2.law13.hotmail.com
> hotmail.com preference = 10, mail exchanger = mc3.law13.hotmail.com
> hotmail.com preference = 10, mail exchanger = mc4.law13.hotmail.com
> hotmail.com preference = 10, mail exchanger = mc5.law13.hotmail.com
> hotmail.com preference = 10, mail exchanger = mc6.law13.hotmail.com
> hotmail.com preference = 10, mail exchanger = mc4.law5.hotmail.com
> hotmail.com preference = 10, mail exchanger = mc5.law5.hotmail.com
> hotmail.com preference = 10, mail exchanger = mc6.law5.hotmail.com
> hotmail.com preference = 10, mail exchanger = mc7.law5.hotmail.com
>
> I don't know what the intention was so that all exchangers were set to
> have the same priority. Problem is, James tries to connect to all the
> servers and then send the email. Basically, everything would be fine.
> Except that it's a waste of resources (ie: TCP connections), IMO. And I
> think it would make sending out email a bit longer.
Mail servers are supposed to attempt to connect to every mail server listed
in DNS (in order, but since there is no order, that doesn't really matter).
This is so you can turn off half of your mail servers, and still receive
email. The exception you included (no route to host) is a good reason for
it to continue trying other servers.
I'm not sure if James is being smart about the kind of failure though... if
it's a socket exception, it should try the next (as with the exception
included), but then if it does connect and there's some failure (like an
invalid address), then in theory it should stop attempting. The problem is
those SendMailExceptions are not always clear what the problem was.
Serge Knystautas
Loki Technologies
http://www.lokitech.com/
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