diff --git a/README.md b/README.md
index dc7d54b..4c6f05e 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,7 @@ For more terminal shell goodness, please also see this list's sister list [Aweso
     - [App Store](#app-store)
     - [Apple Remote Desktop](#apple-remote-desktop)
     - [iTunes](#itunes)
+    - [Mail](#mail)
     - [Safari](#safari)
     - [Sketch](#sketch)
     - [TextEdit](#textedit)
@@ -151,6 +152,36 @@ rm -r ~/Library/Containers/com.apple.RemoteDesktop
 launchctl unload -w /System/Library/LaunchAgents/com.apple.rcd.plist
 ```
 
+### Mail
+
+#### Vacuum Mail Index
+The code below will quit Mail, vacuum the SQLite index, then re-open Mail. On a large email database that hasn't been optimized for a while, this can provide significant improvements in responsiveness and speed.
+```applescript
+(*
+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
+*)
+
+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 "V3"
+end considering
+
+set sizeBefore to do shell script "ls -lnah ~/Library/Mail/" & mail_version & "/MailData | grep -E 'Envelope Index$' | awk {'print $5'}"
+do shell script "/usr/bin/sqlite3 ~/Library/Mail/" & mail_version & "/MailData/Envelope\\ Index vacuum"
+
+set sizeAfter to do shell script "ls -lnah ~/Library/Mail/" & mail_version & "/MailData | grep -E 'Envelope Index$' | awk {'print $5'}"
+
+display dialog ("Mail index before: " & sizeBefore & return & "Mail index after: " & sizeAfter & return & return & "Enjoy the new speed!")
+
+tell application "Mail" to activate
+```
+
 ### Safari
 
 #### Enable Develop Menu and Web Inspector