==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.7 professional
- Linux/BSD distribution name and version: CentOS Linux 7
- 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.
====
We have users on Rackspace and users in-house - both on the same domain (al-babtain.com.sa) 
some users are common on both, and some mailboxex on Racksapce are not in the in-house Server and vice versa.

When I send an email from Rackspace to in-house mailbox I get the below message.
testnew@al-babtain.com.sa (after RCPT TO): 554 5.7.1
>>> <testnew@al-babtain.com.sa>: Recipient address rejected: SMTP AUTH
>>> is required, or it is a spam with forged sender domain

What IP's should I add to /opt/iredapd/settnigs.py, parameter MYNETWORKS = ???
to allow the SMTP AUTH.