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Speed up Mail.app
(*
Speed up Mail.app by vacuuming the Envelope Index
Code from: http://www.hawkwings.net/2007/03/03/scripts-to-automate-the-mailapp-envelope-speed-trick/
Originally by "pmbuko" with modifications by Romulo
Updated by Brett Terpstra 2012
Updated by Mathias Törnblom 2015 to support V3 in El Capitan and still keep backwards compability
Updated by @lbutlr for V5 and Container folder in High Sierra and use du
*)
tell application "Mail" to quit
set os_version to do shell script "sw_vers -productVersion"
set mail_version to "V2"
considering numeric strings
if "10.10" os_version then set mail_version to "~/Library/Mail/V3/Maildata/Envelope\\ Index"
if "10.12" < os_version then set mail_version to "~/Library/Mail/V4/Maildata/Envelope\\ Index"
if "10.13" os_version then set mail_version to "~/Library/Containers/com.apple.mail/Data/Library/Mail/V5/Maildata/Envelope\\ Index"
end considering
set sizeBefore to do shell script "du -h " & mail_version & "| awk {'print $1'}"
do shell script "/usr/bin/sqlite3 " & mail_version & " vacuum"
set sizeAfter to do shell script "du -h " & mail_version & "| awk {'print $1'}"
display dialog ("Mail index before: " & sizeBefore & return & "Mail index after: " & sizeAfter & return & return & "Enjoy the new speed!")
tell application "Mail" to activate

clmac commented Oct 27, 2017

This script is not compatible with oldest version (before 10.10). To allow this, you need to change the line set mail_version to "V2" by set mail_version to "~/Library/Mail/V2/Maildata/Envelope\\ Index"

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