======== Required information ====
- iRedMail version (check /etc/iredmail-release): Latest
- Linux/BSD distribution name and version: RedHat\CentOS 7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): ginx
- Manage mail accounts with iRedAdmin-Pro? Possibly
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

A few questions before we make a commitment to iRedMail...

1) We are needing to allow our iRedMail users to send to one external domain only and not be able to communicate with each other (i know that is not normal but it is what it is). So in essence, the users can send a receive from this one external domain but not to each other or any other domains. I think i can do this with whitelist of @externaldomain.com and a blacklist of @. but I am not sure. Will that work? Thoughts?

2) If we have an outage and need support, how fast is it usually to get assistance? Hours, days? What time zone is support in?

Any help is appreciated, we are trying to make a decision between this and Zimbra, etc.

Steve