==== Required information ====
- iRedMail version: 0.8.7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: CentOS 6.5 x64
- Related log if you're reporting an issue:
====
Hello, like i'm seeing in other topics, seems to be normal to have problems when you want receive mails from Gmail, Hotmail, and others mail servers.
I recently install iredmail and first i must to say: Awesome tool, so easy install it, you dont need to be expert in mail servers to install and that's great job.
As everyone, first i did after install was login in postmaster@.... send mail to my gmail account and:
-Whoa! It's work.
Then i writte a mail to my postmaster account from gmail account and.... fail 
I read a lot about dns problems in other cases, about greylist and i cant find solution to this problem. So please can you give me some advise to resolve this? Im not a expert in servers and it's being hard for me.
Thank you for read.