diff --git a/AveNoAnimationsInMailPlugin/AveHookBootstrapper.m b/AveNoAnimationsInMailPlugin/AveHookBootstrapper.m
index 795a60c..756c72c 100644
--- a/AveNoAnimationsInMailPlugin/AveHookBootstrapper.m
+++ b/AveNoAnimationsInMailPlugin/AveHookBootstrapper.m
@@ -14,9 +14,9 @@ @implementation AveHookBootstrapper
 
 static BOOL elCapitanOverrideTransactionDurationToZero = NO;
 
-+(BOOL)isElCapitan
++(BOOL)isAtLeastElCapitan
 {
-    static BOOL isElCapitan = NO;
+    static BOOL isAtLeastElCapitan = NO;
     
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
@@ -26,11 +26,31 @@ +(BOOL)isElCapitan
             NSOperatingSystemVersion version = {0};
             version.majorVersion = 10;
             version.minorVersion = 11; // el cap
-            isElCapitan = [processInfo isOperatingSystemAtLeastVersion:version];
+            isAtLeastElCapitan = [processInfo isOperatingSystemAtLeastVersion:version];
         }
     });
     
-    return isElCapitan;
+    return isAtLeastElCapitan;
+}
+
+
++(BOOL)isAtLeastSierra
+{
+	static BOOL isAtLeastSierra = NO;
+	
+	static dispatch_once_t onceToken;
+	dispatch_once(&onceToken, ^{
+		NSProcessInfo* processInfo = [NSProcessInfo processInfo];
+		if([processInfo respondsToSelector:@selector(isOperatingSystemAtLeastVersion:)])
+		{
+			NSOperatingSystemVersion version = {0};
+			version.majorVersion = 10;
+			version.minorVersion = 12; // sierra
+			isAtLeastSierra = [processInfo isOperatingSystemAtLeastVersion:version];
+		}
+	});
+	
+	return isAtLeastSierra;
 }
 
 static IMP AveReplaceMethod(Class class, BOOL isMetaClass, SEL sel, id block) {
@@ -118,6 +138,22 @@ +(void)aveElCapitanSwizzleComposeWindowControllerPerformSendAnimation
     });
 }
 
+// -[ComposeWindowController _performSendAnimationWithCompletion:](void * self, void * _cmd, void * arg2) {
++(void)aveSierraSwizzleComposeWindowControllerPerformSendAnimationWithCompletion
+{
+	Class class = NSClassFromString(@"ComposeWindowController");
+	SEL sel = @selector(_performSendAnimationWithCompletion:);
+	__block IMP originalImplementation = AveReplaceInstanceMethod(class, sel, ^(id obj, id block){
+		elCapitanOverrideTransactionDurationToZero = YES;
+		if(originalImplementation != NULL)
+		{
+			((void(*)(id, SEL, id))originalImplementation)(obj, sel, block);
+		}
+		
+		elCapitanOverrideTransactionDurationToZero = NO;
+	});
+}
+
 +(void)aveElCapitanSwizzlePopoutAnimationController_animateFrom_to_withCompletion
 {
     Class class = NSClassFromString(@"PopoutAnimationController");
@@ -226,6 +262,11 @@ -(void)_performSendAnimation
 	}
 }
 
+- (void)_performSendAnimationWithCompletion:(id)block
+{
+	NSLog(@"Ave _performSendAnimationWithCompletion: should not be called in our class!");
+}
+
 // this will never be called, but we define it so we can call it in the swizzled
 // method _performSendAnimation in this class. However, _performSendAnimation will
 // only be called in the context of DocumentEditor, so -[DocumentEditor _sendAnimationCompleted]
@@ -276,7 +317,8 @@ +(void)aveSwizzleWindowTransformAnimation
 +(void)load
 {
 	NSLog(@"Ave: Loaded, time to start swizzling");
-    if([self isElCapitan])
+	
+    if([self isAtLeastElCapitan])
     {
         [self aveElCapitanSwizzleCATransactionSetAnimationDuration];
         [self aveElCapitanSwizzleNSAnimationContextSetDuration];
@@ -285,6 +327,11 @@ +(void)load
         [self aveElCapitanswizzlePopoutAnimationController_internalTransitionAnimationWithDestination_fadeOut];
         [self aveElCapitanSwizzleWindowTransformAnimation__animationDurationForAnimationType];
         [self aveElCapitanSwizzleFullScreenWindowController_animateModalWindowClose];
+		
+		if([self isAtLeastSierra])
+		{
+			[self aveSierraSwizzleComposeWindowControllerPerformSendAnimationWithCompletion];
+		}
     }
     else
     {
diff --git a/AveNoAnimationsInMailPlugin/AveNoAnimationsInMailPlugin-Info.plist b/AveNoAnimationsInMailPlugin/AveNoAnimationsInMailPlugin-Info.plist
index 25f11ce..82bf681 100644
--- a/AveNoAnimationsInMailPlugin/AveNoAnimationsInMailPlugin-Info.plist
+++ b/AveNoAnimationsInMailPlugin/AveNoAnimationsInMailPlugin-Info.plist
@@ -21,11 +21,18 @@
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>1.2</string>
+	<string>1.3</string>
 	<key>NSHumanReadableCopyright</key>
-	<string>Copyright © 2015 AveApps. All rights reserved.</string>
+	<string>Copyright © 2017 AveApps. All rights reserved.</string>
 	<key>NSPrincipalClass</key>
 	<string>AveHookBootstrapper</string>
+	<key>Supported10.12PluginCompatibilityUUIDs</key>
+	<array>
+		<string># mail 10.0 (macOS Sierra 10.12)</string>
+		<string>36CCB8BB-2207-455E-89BC-B9D6E47ABB5B</string>
+		<string># mail 10.2 (macOS Sierra 10.12.2)</string>
+		<string>1CD3B36A-0E3B-4A26-8F7E-5BDF96AAC97E</string>
+	</array>
 	<key>SupportedPluginCompatibilityUUIDs</key>
 	<array>
 		<string># All Mail UUIDs</string>
@@ -76,10 +83,5 @@
 		<string># for macOS Sierra</string>
 		<string>36CCB8BB-2207-455E-89BC-B9D6E47ABB5B</string>
 	</array>
-	<key>Supported10.12PluginCompatibilityUUIDs</key>
-	<array>
-		<string># mail 10.0 (macOS Sierra 10.12)</string>
-		<string>36CCB8BB-2207-455E-89BC-B9D6E47ABB5B</string>
-	</array>
 </dict>
 </plist>
diff --git a/Output/AveNoAnimationsInMailPlugin.mailbundle.zip b/Output/AveNoAnimationsInMailPlugin.mailbundle.zip
index 211f3c5..40306ce 100644
Binary files a/Output/AveNoAnimationsInMailPlugin.mailbundle.zip and b/Output/AveNoAnimationsInMailPlugin.mailbundle.zip differ
diff --git a/Output/AveNoAnimationsInMailPlugin.mailbundle/Contents/Info.plist b/Output/AveNoAnimationsInMailPlugin.mailbundle/Contents/Info.plist
index e77a0ca..8bc7c65 100644
--- a/Output/AveNoAnimationsInMailPlugin.mailbundle/Contents/Info.plist
+++ b/Output/AveNoAnimationsInMailPlugin.mailbundle/Contents/Info.plist
@@ -3,7 +3,7 @@
 <plist version="1.0">
 <dict>
 	<key>BuildMachineOSBuild</key>
-	<string>15G1004</string>
+	<string>16C68</string>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>English</string>
 	<key>CFBundleExecutable</key>
@@ -25,29 +25,31 @@
 		<string>MacOSX</string>
 	</array>
 	<key>CFBundleVersion</key>
-	<string>1.2</string>
+	<string>1.3</string>
 	<key>DTCompiler</key>
 	<string>com.apple.compilers.llvm.clang.1_0</string>
 	<key>DTPlatformBuild</key>
-	<string>7D1014</string>
+	<string>8C1002</string>
 	<key>DTPlatformVersion</key>
 	<string>GM</string>
 	<key>DTSDKBuild</key>
-	<string>15E60</string>
+	<string>16C58</string>
 	<key>DTSDKName</key>
-	<string>macosx10.11</string>
+	<string>macosx10.12</string>
 	<key>DTXcode</key>
-	<string>0731</string>
+	<string>0821</string>
 	<key>DTXcodeBuild</key>
-	<string>7D1014</string>
+	<string>8C1002</string>
 	<key>NSHumanReadableCopyright</key>
-	<string>Copyright © 2015 AveApps. All rights reserved.</string>
+	<string>Copyright © 2017 AveApps. All rights reserved.</string>
 	<key>NSPrincipalClass</key>
 	<string>AveHookBootstrapper</string>
 	<key>Supported10.12PluginCompatibilityUUIDs</key>
 	<array>
 		<string># mail 10.0 (macOS Sierra 10.12)</string>
 		<string>36CCB8BB-2207-455E-89BC-B9D6E47ABB5B</string>
+		<string># mail 10.2 (macOS Sierra 10.12.2)</string>
+		<string>1CD3B36A-0E3B-4A26-8F7E-5BDF96AAC97E</string>
 	</array>
 	<key>SupportedPluginCompatibilityUUIDs</key>
 	<array>
diff --git a/Output/AveNoAnimationsInMailPlugin.mailbundle/Contents/MacOS/AveNoAnimationsInMailPlugin b/Output/AveNoAnimationsInMailPlugin.mailbundle/Contents/MacOS/AveNoAnimationsInMailPlugin
index 98adef3..91cfe51 100755
Binary files a/Output/AveNoAnimationsInMailPlugin.mailbundle/Contents/MacOS/AveNoAnimationsInMailPlugin and b/Output/AveNoAnimationsInMailPlugin.mailbundle/Contents/MacOS/AveNoAnimationsInMailPlugin differ
diff --git a/Output/DisableMailAnimationsForOSX.pkg b/Output/DisableMailAnimationsForOSX.pkg
index 1276fe9..3425b85 100644
Binary files a/Output/DisableMailAnimationsForOSX.pkg and b/Output/DisableMailAnimationsForOSX.pkg differ