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I am not able get accepted calendar invitation mail in Thunderbird. i got the mail of event invitation but when i press "accept" button i will get thefail mail

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I have cretaed event invitation for some user but when they accept the invitation they will get mail of "Mail delivery failed: returning message to sender"

Plz help!!!

I have cretaed event invitation for some user but when they accept the invitation they will get mail of "Mail delivery failed: returning message to sender" Plz help!!!