Delete message in my server then delete in emClient

When I delete emails im my server then those emails are also deleted in eMClient. How could I keep those email kept in eMClient and deleted only in my server?

Hello Jose,
your mail account is set up with a mail protocol that synchronizes all the data with your server (either IMAP or Exchange).
I’d suggest making use of the Local folders in eM Client (Menu>Tools>Settings>General, Show Local folders).
This is a folder structure that will be shown under your mail account in the left-side menu. These folders are stored only in your database.
Moving the messages here will save them in your computer AND remove them from the server.

If you choose to save any data locally in eM Client I also recommend setting up Automatic Backup in the Settings to avoid any data loss should your database files get lost or corrupted.