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Topic: prepare my system for installation

I would like to prepare my system for installation of iredmail. I could use some help doing this.

I have: (according to my VPS documentation) VPS.  4.5 GB RAM.  Full Root Admin Access.  1 Dedicated IPv4 Address.  Operating System: Debian 11 64 Bit.

I read: Allowed 0 links

Port 25 is blocked.
Allowed 0 links  says:
port 22  SSH  open, incoming traffic allowed.
port 25  SMTP  closed, incoming traffic denied.
All other ports say: closed, incoming traffic denied.
iredmail instructions say to contact my ISP. I guess my ISP is My VPS host?
My VPS host says: "We do not block any ports on our side. Please ensure you do not have any ufw or firewall rules on your server, or SELINUX, that could be blocking your ability to utilize said ports."  So it looks like this is not a network or hardware related issue. Please help.

iredmail instructions say to Set a fully qualified domain name (FQDN) hostname on my server. I do not have domain name. Will this work?
Allowed 0 links
Our free domains are Second Level Domains. just like a fully functional domain that allows you to create a host name that point to either dynamic or static IP address. You can even create unlimited subdomains. You may manage your domain DNS remotely using our DNS API Document and use it with our Dynamic DNS Service.

I have not changed my server since I got it. I call that a fresh install. Can you give me the commands to make sure my server does NOT have mail related components installed, e.g. MySQL, OpenLDAP, Postfix, Dovecot, Amavisd, etc?

iredmail instructions say to Enable default official Debian/Ubuntu apt repositories. Will this work?
/etc/apt/sources.list
Debian 11 (Bullseye) Original:
deb Allowed 0 links bullseye main contrib non-free
deb Allowed 0 links bullseye-updates main contrib non-free
deb Allowed 0 links bullseye-security main contrib non-free
Do I need the  contrib non-free?

I do not know how to do this:
spam/virus scanning enabled. Make sure 3 UID/GID are not used by other user/group: 2000, 2001, 2002.

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Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Stable release is out.

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Re: prepare my system for installation

b1bb2 wrote:

iredmail instructions say to Set a fully qualified domain name (FQDN) hostname on my server. I do not have domain name. Will this work?

If you don't have a domain name, what do you use for email domain name?

Please follow our tutorial to install iRedMail:
https://docs.iredmail.org/#install

Since it's VPS, if you messed it, it's easy to start over again. So just do it.