======== Required information ====
- iRedMail version: 0.9.2
- Linux/BSD distribution name and version: Ubuntu server 14.04 LTS
- Store mail accounts in which backend: MySql
- Web server: Apache
- Manage mail accounts with iRedAdmin-Pro? No
- Related log if you're reporting an issue: log.txt
====

I had only A - records dns (sach as "domain.com" and "www.domail.com"), because I forgot to create mx - record.

1) is there inough to create one mx - record as: domain.com MX 10 mail.domail.com?

So, when I had been installing iRedmail, I was asked to write first mail domain name which could not be the same as "domain.com" (I find that I was offered "domail.com" because of absence of MX-record). I entered mail.domain.com, but I wanted to enter only "domail.com" for the better view like "info@domail.com"

I've got an ugly postmaster@mail.domain.com instead of postmaster@domail.com

When I had been sent message I was informed of "Undelivered Mail Returned to Sender" to my Roundcube webmailer whith "Diagnostic-Code: smtp; 550 Unroutable sender address" exception.

So, guys, how can I configure my mail-server to work and to form the user's account like "user@domail.com" not "user@mail.doamil.com"?

Thanks in advance...

p.s. Now I have an MX-record, but how I can reconfigure iRedMail?
p.s.s
/etc/hosts:
127.0.0.1    localhost
99.99.99.99 domain.com domain
# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

/etc/hostname:
domain