External Auto Reply- No sender

When External Out of office sends external emails that have "No sender". Therefore they are getting blocked by the hygiene system. Is there a way to set out of office to identify the sender for the Out of office to work without diminishing out security?
claudiamcseAsked:
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TalkExchangeCommented:
It is as per RFC 2298

Check this

http://social.technet.microsoft.com/forums/en-US/exchangesvrgeneral/thread/2bf53ac6-bba2-4f53-916d-eaaeefd4e5d8/

so it isnt possible to workaround it. But check if you can add exceptions as these messages will have

Disposition-Notification-To header

so if blank sender has this header bypass it or something. Dunnof if the hygiene system has this option.
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endital1097Commented:
these are system generated messages and therefore do not have a sender address
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claudiamcseAuthor Commented:
Great! thanks
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