Cont.How you can improve e-mail deliverability by working on your IP and domain reputation
If you run your own mail server, you’ll sooner or later likely run into e-mail deliverability problems due to what is called IP and domain reputation. Especially larger providers have various and sometimes not easy to understand filtering systems in place that might refuse messages from your machine.
Part 2.
https://blog.effenberger.org/2022/02/28 ... bility-ii/
Cont.This article is split in two parts. The already published first part explains the general issue and gives some advice and best practice, while in this second part of this article I will introduce you to the concept of DNS-based blackhole list (DNSBL), feedback loops (FBLs), DNS-based whitelists (DNSWL), and share a set of antispam services to check your IP address against, to help remedy delivery issues.