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NDR and OOF issue

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NDR and OOF issue - 2.Dec.2009 10:05:32 PM   
yousef.fattal

 

Posts: 1
Joined: 8.Sep.2009
Status: offline
Hello guys,

I have one exchange server with three roles installed' mailbox,client access and hub transport,
My ISP blockes port 25 and forcing us to use their servers to relay on for external emails, the problem is that their server not relible at all. I have configured a smart host "yahoo SMTP servers with our bushiness account" for delivering email and everything wen perfect till i notice something went wrong !
all of my emails going out perfectly except our NDRs and Out Of Office messages, either not delivered with error on the tracking center "501 syntax error in arguments" or dropped silently.
I need NDRs and OOFs to be deliverd to external senders and I still have to use Yahoo smart host for now.
as I know, the problem is that Yahoo and most of the relay servers doesn't allow emails with blank email address in the From filed, and as i know exchange designed to do this !
any clues guys ?

thank you all for any help
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