==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.2 (MARIADB edition)
- Deployed with iRedMail Easy or the downloadable installer? Downloadable installer
- Linux/BSD distribution name and version: CentOS-7-x64-minimal +headless
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MariaDB
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
OS: CentOS-7-x64-minimal +headless

Hiya,

If I want to test iRedMail in Virtual Machine before installation to debug the possible errors locally before installation, what shall I set for Domain name section in installation?
> hostname -f
mx.example.com
??

And for below:

    /etc/hostname:

    mx.example.com

    /etc/hosts: hostname <=> IP address mapping. Warning: List the FQDN hostname as first item.

    127.0.0.1 mx.example.com mx localhost localhost.localdomain

And then what will be my domain name in Virtual Machine installation? 127.0.0.1, localhost localhost.localdomain or what?

Update I: I installed this iRedMail on CentOS7-x64(fresh clean installation) on Virtual Machine and its still can't send any email? (I'm not sure it it an receive email on Virtual Machine or not?)

Tnx and best of luck