On Fri, 14 Jun 2013 17:10:16 +0200, Bernhard Schmidt <be...@birkenwald.de> 
wrote:

> This gets even worse when the mail has two recipients
> ... doesnotexist@ does not exist, t1@ does...
>
> mail from: <t...@test.de>
> 250 2.1.0 Sender OK
> rcpt to: <doesnotex...@test.customer.de>
> 250 2.1.5 Recipient OK
> rcpt to: <t...@test.customer.de>
> 250 2.1.5 Recipient OK
> data
> 354 Start mail input; end with <CRLF>.<CRLF>
> test
> .
> 550 5.1.1 User unknown

quick and rough work-around might be
smtp_destination_recipient_limit = 1

for the Postfix before E-2013.


> According to this threat:
>
> http://social.technet.microsoft.com/Forums/en-US/exchangesvrdeploy/thread/91c26fd2-aa0c-4006-9326-ece609bf4f67/
>
> this is expected. I can hardly believe that.

Unbelievable... it's harmful threat X-(.

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