Setting Up Email Server - WHM and Ionos cloud need Help.

Operating System & Version
OS CentOS v7.9.2009
cPanel & WHM Version
cPanel & WHM Version 106.0.9

Bessalah lounes

Oct 11, 2022
cPanel Access Level
Root Administrator
Hi everyone,

This is my first experience with IoNos Cloud (Centos7 OS)+WHM.

I have been trying since yesterday to install my mail server. so I currently have:

- a DNS configuration: Done.Figure 1

- a rDNS points to my domain host.Figure 2 and Figure 3

- and my WHM indicates that DKIM+SPF and PTR are VALID. Figure 4
(WHM root & CPANEL).

- Named. active ,confd and working. Figure 7

- Firewall open ports. Figure 8

but when sending emails I receive emails bouncing error 5.0.0 for certain destinations. Figure 5 Figure 6

for others I do not receive any acknowledgment message (Gmail.) Frozen

I really don't know what i m missing but If anyone could help me solve this problem I would be very grateful.

Thank you ALL.
Last edited by a moderator:


Jurassic Moderator
Staff member
Oct 19, 2014
cPanel Access Level
Root Administrator
Hey there! I'm not able to open your screenshot links. Can you try posting those here directly, or maybe using a site like Imgur to share those? If you could also share the full text of the bounceback message that would likely be enough for us to help.