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?
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It is as per RFC 2298

Check this


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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these are system generated messages and therefore do not have a sender address
claudiamcseAuthor Commented:
Great! thanks
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