How to build (develop) enterprise mail system by yourself

General e-mail systems of government and enterprise departments, such as user@ domain name .com. How the interior is built.
Please provide an idea


that is determined by the MX record of DNS, as long as DNS is configured correctly.

the most troublesome thing about the enterprise mail system is the spam Filter rules. It is actually very easy to build. You can directly configure a mailbox system with postfix ., windows server can also be installed with exchange to implement the mail server. With the MX record, you can send and receive email under your own domain name. However, exposure to the Internet only a few days will encounter all kinds of spam, I have tried before.

or using the open source iRedMail can also easily create a mail system on a graphical interface without development.

usually if there is no special need, I would suggest using the ready-made service from the mailbox service provider directly, and the price is acceptable, which is much easier than building and maintaining it yourself. For example, Tencent free corporate mail supports 50 accounts, and NetEase free corporate mail supports 200 accounts, which is basically enough. The postage charges of domestic enterprises are basically charged according to the number of accounts.

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