Wanwei Telecom has been operating Hong Kong servers for more than 20 years. Many customers have asked this question: Is port 25 of your Hong Kong server open? Every time we encounter this question, we have to explain it again: All ports of Hong Kong servers are open and are completely managed and used by customers.
Of course, the premise of all this is to comply with Hong Kong's laws and regulations and the rules of the computer room. After the Hong Kong server installation system is opened, there is no backdoor in the computer room, and the customer has all the management rights of the server. Port 25 is opened by the SMTP (Simple Mail Transfer Protocol) server, which is mainly used to send emails. Although port 25 is relatively sensitive and easy to be taken advantage of, as long as the server security settings are done well, it can still be used with confidence.
There is another situation here. If the customer uses port 25 to send spam, the data center will definitely ask the user to deal with it after receiving the complaint. In serious cases, the server will be shut down directly, not just port 25. If it is for legal purposes, there is no need to worry about the Hong Kong server banning port 25, and you can freely set up a mail server