Phips
Your problem may be one of many things bu the error message you’re getting is known about and is because the pwauxprop.la and .so files have permissions that the system doesn’t like, not because they are wrong. They are set like this so that the mail group doesn’t have access to them. These errors are normal.
The comments to that particular article are very long but try some of these to point you in the right direction;
Pg 1 for the initial fix AND most of the common faults. See especially about Troubleshooting 1-7.
Pg 8 for epaulsen’s fixes for the changes Apple made in 10.3.9.
This should get you on the right track as to why your vacation messages won’t work.
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