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Mac Mail

Open Mail.  Choose the top left “Mail” menu.

Mail -> Preferences -> Accounts button
Click the + symbol at the bottom left to create a new account.

Choose “Add Other Mail Account” -> Continue
Fill out the Full Name, Email Address and Password

Account must be configured manually -> Next

Set the Incoming Mail Server Info
Choose an Account Type of either IMAP or POP
Mail Server: z.xc.org
User Name: (your e-mail address)
Password:

For additional information, if requested:
Path Prefix: (blank)
Port: 993
Use SSL: Checked
Authentication: Password

Set the Outgoing Mail Server Info
Mail Server: z.xc.org
User Name: (your e-mail address)
Password:

For additional information, if requested:
Port: 587
Use SSL: Checked
Authentication: Password

Select the new account in the list on the left, and then click the Mailbox Behavior button.
Change the setting for “Delete junk messages when: “ to “one month old.”

Click the red “X” in the top left of the Accounts window to exit.  You will be prompted to save your changes.  Click the Save button.