Step 1: Go to Mail, then click Preferences.
Step 2: The tab that opens by default is the Accounts tab where you can manage the options related to your mail accounts.
Step 3: Go to Mailbox Behaviors. This is where you can set how the program treats sent, junk and deleted messages.
Step 4: The advanced tab shows additional options for the selected mail account. You can also manage the SSL settings here.
Step 5: Let’s look at General options and sets how often Apple Mail will check for new messages on the server.
Step 6: The RSS tab is where you can change settings related to your RSS feeds. Set your default RSS reader.
Step 7: The Junk Mail tab is where you enable or disable junk mail filtering and set how the program reacts when you receive junk mail.
Step 8: On the Fonts & Colors tab, you can set what the font will look like for mailboxes, messages, notes, etc.
Step 9: The Viewing options let you change settings related to viewing messages including the header detail and message threading.
Step 10: The last two tabs, Signatures and Rules.