If you want it to...you can select in the settings to either mark as read or delete from server. It also depends on what email you have (IMAP, POP3, Activesync).
Usually yes. You can set it in your preferences for the account. If it is IMAP, there is an option to delete from the server when deleted from the client. If it is POP, you will choose leave a copy on the server.
If you want it to...you can select in the settings to either mark as read or delete from server. It also depends on what email you have (IMAP, POP3, Activesync).