In my job, I have to have a signature that has sensitive information on it. Consequently, I cannot trust to have use apple mails signature. For the purpose advertised, it works reasonably well. However, when I first started using it, somehow it changed my email settings from the Exchange Server system I used to retrieve emails from gmail resulting in an inability to send or receive emails. Unfortunately, I was unable to fix this change and had to revert back to the normal way to fetch gmail. Once changed, it worked well.