Hello. since updating to the newest macOS Mojave update, Mail has been opening by itself periodically and it getting very annoying and I don't know what is prompting it. If I am in full screen mode, mail will open and take up the right side of the screen also. I have tried reinstalling the operating system over the current installation to see if the system could rebuild itself and fix the issue but this was not successful. Thank you for your help. --- Post Merged, May 23, 2019 --- Also, I installed the supplemental update on my 2018 MacBook Pro, and this did not fix the issue. Also, Mail is not in my startup items.