I was looking for a way to schedule my email to send later, rather than having to remember to click send at the time I wanted it to be sent. I found MailButler and it worked well within Apple Mail, which was great as I didn't want to have to learn a new mail app. I also discovered other features like a 10second delay after you hit send, which gives a little buffer in case you hit send by mistake, or those times when you realise you forgot to say something, or got some information wrong. The delivery tracker is also pretty handy - it lets you know if the email has been delivered and/or opened. It has an easy to use interface too which gets out of the way to let you get on with your emails.

Easy to use, fast to setup and useful tools missing in Apple Mail. The Multiplatform integration and plug-ins allows the team to work between OS's without hassle, but it really allowed me to use my favorite mail tool to work with my team properly. Until now I didn't have the need to use the costumer support, but I believe this is a good point so far.

I only have the basic unpaid version but it has already saved me from sending emails that I was not quite ready to send. I got it because I wanted a way to schedule emails to be sent in the future from directly within Mail. I have not even begun to scratch the surface of all of the features in this program but I very much like what I see and love the "undo send" feature.