Q: does delete sent messages when delete from server and computer?

Hi

I'm on OS X Yosemite, Mail v.8.2.

Under Mailbox Behaviours, I have "Store sent messages on the server" ticked, so sent messages are saved both on the server and in my Mail program.

I have "Delete sent messages" set to "Never".

If I select "Delete sent messages" to something else, like "One week old" for example, are the messages deleted from BOTH the server and my Mail program?

Many Thanks