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Recipient Verification with Exchange 2013

Using callout doesn't work anymore. As mentioned here

exchange 2013 recipient filtering

the recipient filter works different as in Ex2010:

I have also noticed that Recipientfiltering doesn't work exactly the same way as in EX07/EX10.
When enabled, you should get an 550 5.1.1 User unknown after the ending period (see below)


mail from:
250 2.1.0 Sender OK
rcpt to:
250 2.1.5 Recipient OK
data
354 Start mail input; end with .
Write some Text Here
.
550 5.1.1 User unknown


Is this a known issue for development?


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