How can I correctly change the hostname for ISPConfig and the root domain name?

Hello

I have a server with ISPConfig 3 panel.

The hostname is for example: Name-number1

The domain name is:
firstname-lastname.com

On this server I now have wordPress sites from other users.

When they send emails from their sites, the preview of the original message shows the hostname and the root domain.

I want to change the hostname to a different one, and the root domain to a different one, so that my name does not appear in their emails.

For example:

Other-name-host.other-domain.com

I thought I could change the hostname and domain directly in the ISPConfig panel.

1)
What happens if I change the hostname and domain directly in the ISPConfig panel?

The server already has the websites, databases and mail of other users configured.

If the ISPConfig panel changes the hostname and domain correctly e.g. in databases and mailboxes I understand that I also have to correct this in my clients' website files etc.

2)
Is there any other way for SMTP server not to add its hostname together with main domain name in headers? - if yes, where can I set it?

3)
Will changing just the name in [System] > [Server config] execute all changes of this name, in all services and will they work properly after such change?

Regards
Peter

 

Thank you for your help.

I have edited the files provided.
But I don't see that the server name has changed.
Still, everything seems to work as it did before.
I haven't checked email shipping yet.

This VPS server has external IP 11.22.33.44 and internal IP 88.88.88.88

And after rebooting the system, the /etc/hosts file
Looks like this:

127.0.0.1 localhost.localdomain localhost
11.22.33.44 new-name.new-domain.com new-name

::1 localhost ip6-localhost ip6-loopback
ff01::1 ip6-allnodes
ff01::2 ip6-allrouters

# Auto-generated hostname. Please do not remove this comment.
88.88.88.88 old-name

In the file:
/etc/hostname
Assign the previous old name to exist.

Only on file:
/etc/mailname
there has been a permanent change and the new domain is there


Before I did the editing of these files, I added new DNS entries and a new page in the ISPConfig panel.

New-domain.com

And I checked to see if it was working.
At this point, I can still log into the ISPConfig panel via the previous subdomain.
But logging into the ISPConfig panel from the new sub domain does not work.
What can this be caused by?

Maybe I should do a restart in some other way instead of the reboot instruction (SSH)

 

Thank You for your help !

I made a mistake at some point and everything stopped working ;-(

But I sat up all night and managed to restore everything to the state before modification.

Now I re-did everything in that order:

1. I used the old hostname as a subdomain by adding it to the new domain in the provider's DNS.

oldNameHost.NewNameDomain.com

2. I waited for DNS propagation

3. Then in the ISPConfig panel I created a DNS zone for this subdomain as a domain:
oldNameHost.NewNameDomain.com
Selecting the creation of a SSL certificate

4. I checked in the browser - everything is OK, - there is a certificate on this domain correctly generated.

5. So in /etc/hosts file I changed only domain itself (host name which is subdomain stayed old)

6. I also changed the domain in the file:
/etc/mailname

7. I ran the command:
ispconfig_update.sh -force

8. Everything went fine (I know that after this description the reader will think where the problem is ...)

9. I logged in under the new root domain and it's OK

But I still see the old name in the ISPConfig panel:

oldNameHost.OldNameDomain.com

But in the given files (/etc/hosts, /etc/hostname and /etc/mailname) the write are as expected:

oldNameHost.NewNameDomain.com

Is there any command that will update this now in the ISPConfig panel?

As a test I created a new domain and it also creates with the old names,
I also did a server reboot and it is still like this.

 

Where, exactly?

What is created with old names? Is the new domain e-mail domain, DNS domain or new website?

 

Super thanks for your help! Is OK