diff -Naur matterbridge-1.11.0.orig/bridge/mattermost/mattermost.go matterbridge-1.11.0/bridge/mattermost/mattermost.go
--- matterbridge-1.11.0.orig/bridge/mattermost/mattermost.go	2018-06-19 06:28:16.000000000 +0800
+++ matterbridge-1.11.0/bridge/mattermost/mattermost.go	2019-04-26 20:40:11.831475087 +0800
@@ -444,6 +444,10 @@
 		return true
 	}
 
+	if message.Username == "github" {
+		return true
+	}
+
 	// if the message has reactions don't repost it (for now, until we can correlate reaction with message)
 	if message.Post.HasReactions {
 		return true