When my friend logs into his user account and tries to open the Mail App, he just gets the spinning ball and it won't open. Safari and other apps will open, but they take forever. When his wife or kids log in under their accounts, the machine is as fast as ever.
I had him repair permissions and verify the disc. Both processes went fine, but did not help.
It's a 5 year old iMac with 4 gig of Ram running the latest version of Yosemite.
Any ideas?
IMac – User account on iMac won’t allow applications to open
emailimacmacos
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Best Answer
One big change since El Capitan - Mail is now in V3
All the rest will be the same.
Try clearing the saved state, rebuilding & reindexing the database...
Clear Saved State
~/Library/Saved Application State/com.apple.mail.savedState
then Enter ⌅com.apple.mail.savedState
folder.Rebuild; Re-index
Source: How to fix Apple Mail by rebuilding and reindexing the Mailbox