Hi, and welcome to JustAnswer! My name is Michelle and I am excited to get started with you.If mail has disappeared from your dock, you can find it by clicking on the magnifying glass in the upper right corner and typing in mail. Once it is open, you can right click the mail icon and choose "keep in dock". Another way to retrive the mail icon is from the applications folder. Open finder, click on the application folder and locate mail. Drag it into the dock
I will stand by while you try to place mail back in the dock
How is it going so far?