Gmail has a mute button Posted on Saturday, April 5th, 2014 at 6:06 am. PTWritten by Dave Mark I did not know this. Gmail makes it easy to drop out of a reply all email thread. Great idea. http://www.johncblandii.com John C. Bland II Been there for a while. http://macography.net/ Pietro Montalcino Useful feature for Gmail users. Outlook has a similar option. Who introduced this feature first?