Hmailserver email server is plagued by Spam

An old man sent me an email in the morning, saying that hisHmailserverA large amount of spam is drowned every day, which directly leads to service dragging. Let me help him see it.
I thought it was because he received too many spam mails and he didn't enable anti-spam. As a result, he found that he had enabled the anti-spam function and also selected RBL and surbl, which is somewhat strange, when I checked his settings, I found that none of the following items were selected.

Er, this translation is very nonsense. I revised it myself. Let's take a look at the English standard.

After reading this, let's look at its logs. There are indeed a lot of spam, the sender and recipient are not local addresses. When asked, his mail server is a fixed IP address and is directly usedHmailserverTo send and receive emails. Unlike mine, I only use it to capture emails from my enterprise mailbox. This problem is not solved. The old man's server does not need to verify the email and sends it to the junk mail server.
Therefore, you need to select one based on the settings in the second figure. We didn't use it as a spam email server or Email Transfer Server. It's not possible to use a non-local user to send it to a non-local user, therefore, it is not allowed that both the sender and receiver are not local users' emails. At the same time, we still need to add SMTP verification. Er, it is not necessary to verify if the sender and receiver are not local users, otherwise, emails cannot be sent.
Therefore, the email server using an independent IP address is not properly configured and never goes online. If you use it for a while, your IP address may be discarded.

 

Reprinted from: http://dagai.net/archives/853