Apple Mail does not search

 Apple mail searches using "Envelope Index" database files.

These are located in 

~/Library/Mail/V#/MailData

where # is some number.


1. Quit mail

2. In the Terminal, just type:

find ~/Library/Mail/V?/MailData -name "Envelope Index*" -delete

3. Re-open mail. It should re-index.

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