sendmail & vacation

Are there any tutorials available on how to set up vacation to operate with a whitelist? My users are requesting I add this functionality to our mail server, but I don't want to create an open bounce. What I wish to do is take a list of domain names of our customer base and allow vacation to only respond to that list. Googling brought back info on using whitelists to use in conjunction with spam blocking, but I haven't been able to weed through all of the results regarding spam to locate anything regarding whitelisting vacation. From the vacation man page, I see that there is an -x option that allows blacklisting, but nothing on whitelisting. Any ideas?

Also, if this functionality is not available using vacation in conjunction with sendmail, would a different MTA offer this functionality?

TIA

Greg Groth

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