hMailServermail server
hMailServer is a GPL-licensed, free email system running on Microsoft Windows. It supports common email protocols SMTP, POP3, and IMAP. It can be easily integrated and developed with many existing network email systems. It has Flexible spam protection and the ability to scan all incoming and outgoing emails with an antivirus system; used by ISPs, companies, governments, schools and technology enthusiasts around the world.

hMailServer comes with a COM library (COM API) that can be integrated with other software. Using the COM library, it is possible to write scripts and applications to call the full functionality of HMailServer. For example, you can integrate hMailServer into your current IT system so new employees automatically get email accounts. You can use a PHP-based web front-end to manage the server using the COM API. hMailServer also has built-in Active Directory integration, which can link email accounts to Domain accounts are integrated.
database
hMailServer system has a built-in small database. The built-in database can save you unnecessary settings and is not affected by other operations. It also supports external databases. External databases can provide better performance and better integration with other platforms, but they are also Makes configuration complicated; hMailServer supports databases: MySQL, Microsoft SQL and PostgreSQL.

Some functions that can be realized:
Basic email sending and receiving functions
Automatic reply, automatic forwarding, automatic system backup
SMTP, POP3, Webmail
Email filtering
IMAP, Secure Services (SSL)
distribution group
Email monitoring
Limits on total domain name space and total number of mailboxes
Automatic cleaning
SMTP SSL connection
Email header replacement
Domain and user sending/receiving restrictions, user access control
Group users
Antivirus engine
AD (Windows Active Directory) user automatic synchronization
No restrictions on domain names
No limit on usage time
Custom backup data
Automatic blocking/login restriction.
Anti-Virus/Anti-Spam (Third Party Basis)
whitelist
Alias
Webmail/web-side management.
For developers, the COM API lets you do whatever you want.

When installing the HMailServer email system, the built-in database is used by default. The installation is simple and no other configuration is required. If you need to use an independent database, please install and configure the database supported by the system first, and then install the email system.
hMailServer Chinese forum provides corresponding Chinese services.
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