[NAME, COMPANY AND ADDRESS, ex.
Jill Smith
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate  85245]
 

Dear [NAME, ex. John Smith], 

I was very happy to hear that you are finally taking some time off to spend with your family.

Although you are an integral member of the team, you had worked so hard during this critical period at the company, that I was becoming concerned for you. 

Don't worry at all about things here. We will all pull together and make sure that things are in tip-top shape for your return.

Take care and see you soon. 

Best regards,

[YOUR NAME, ex. John Jones]