What needs to be configured so that the ip of the mailer does not fall into spam databases (for example, spamhaus)?

Question

Mail server

Good afternoon!
There is a Usergate Mail Server mailer.
When sending letters to some addresses, its ip is entered in spambases, how to fix it?

Answer 1

Here is a good service for a comprehensive check of your mail domain
https://mxtoolbox.com/domain
In short, you must have an SPF record in DNS, a correct record in the reverse DNS zone (at the provider). The presence of DMARC and DKIM is welcome - it will be a plus when checking emails for spam.

Answer 2

This is all true, but not the fact that, for example, your IP (or subnet) was not compromised by previous users. And, most importantly, do not send spam :-)