The mail system installed by has the following basic functions:

1. Access mailserver via IMAP, POP3, SMTP and webmail
2. Secure email communication based on SSL encryption
3. Choose different webmails: Snappymail, Squirrelmail, Roundcube
4. A mail system that can be operated, user can register account and change password
5. Multi-domain management
6. User aliases management
7. Meet modern mail system security standards, including SPF, DKIM and DMARC
8. Basic anti-spam capabilities, including domain verification, IP address verification
9. Advanced anti-spam capabilities such as Rspamd, Postscreen, Postgrey, DNSBL
10. Sending frequency control
11. Set mailbox quota for different users
12. Setup backup MX
13. Setup fallback smtp gateway
14. Provide one-click backup script

Other advanced functions, such as custom policyd service, or milter service, can be negotiated separately.