Email Problem

Job ID: 30894436

Budget: $30 – $250 USD

We have a Linux server with CENTOS 7.9 and Cpanel.
We have various domains inside with various emails.

The problem we encounter is that some emails are sent but without any errors they are not delivered.
If we then send it again it is delivered.

We think it's a DNS problem from what's written online.
However, we prefer to leave the task to experts
Related categories: System Admin Linux DNS Email Developer