- Import CA certificate before finishing mailbox setup.
- Account settings:
- Incoming: IMAP, mxs.ccenter.lan, Auto, SSL/TLS
- Outgoing: SMTP, mxs.ccenter.lan, 587, STARTTLS
- After setting up the account, check folder subscription settings. Unsubscribe anything unwanted.
- Disable Archiving.
- Set Drafts to save in OUTBOX.