Hi!

Recently I came by a very strange effect: Outlook does not alert
the user if the destination mail address does not exist.

If you are using Outlook 2007 or 2010 to send a mail using SMTP-Auth
from a user test@testdomain to a non-existing mailbox
nosuchmail@testdomain, exim will return:

550 unknown local-part <nosuchmehl>

in the SMTP dialog. Here's the log file:

2011-06-23 21:21:38 H=somehost (windog) [xxx.xxx.xxx.xxx] 
I=[xxx.xxx.xxx.xxx]:25 F=<test@testdomain> rejected RCPT 
<nosuchmail@testdomain>: unknown local-part <nosuchmail>

But: Outlook 2007 or 2010 ignores this error: It does not raise an
error, it does not return a failed mail, nothing. It happily sits
there and says: everything's OK.

Anyone ever heard about it ? Does anyone know a fix for this ?
How can one configure Outlook to alert the user about the 550 response ?

-- 
[email protected]            +49 171 3101372                         9 years to go !

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