==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.98
- Linux/BSD distribution name and version: centos 7.5.1804
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MYSQL
- Web server (Apache or Nginx):Nginx
- Manage mail accounts with iRedAdmin-Pro? YES
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
Hi Support ,

I use mailing list function create mail list from group use ,

There have some Issue

When I send a mail receivers include group (mailing  list) and user who in mailing list 

Example : peter.ho@xxx.com is member of service@xxx.com
                    The mail send to service@xxx.com and cc to :peter.ho@xxx.com
I got two mail on the same time ,
The result I want to see is that only one email is displayed in my mail box ,

How can I solve this problem in Iredmail settings?

Think’s