Mail group with members in other domains

Hi Axigen,

I’m using Axigen 10.3.3.50 on CentOS Linux.
It has multiple domains and is configured to use different relays, based on the sender’s domain.
This was configured in SECURITY & FILTERING > Acceptance & Routing > ADVANCED SETTINGS > ADD ACCEPTANCE / ROUTING RULE >

(this is for test1.org)
Conditions
Sender domain is test1.org
Actions
Authentication user: test1.org password: secretpassword
Host name/ip: this-relay.com port: 587

(this is for test2.org)
Conditions
Sender domain is test2.org
Actions
Authentication user: test2.org password: secretpassword
Host name/ip: that-relay.com port: 587

This works as expected when sending emails:
For example, if I use webmail as user1@test1.org and i send an email to gmail.com, Axigen will send the email using the relay this-relay.com

Now I created a mail group group1@test1.org, and one of the members of the group is in gmail.com
When Axigen receives email for group1@test1.org, it is unable to deliver the email to gmail.com
Based on the logs, it looks like Axigen is not using the configured relay. It is trying to deliver the email directly to gmail.com

How can I configure Axigen to use the configured relay when sending out to group members who are in gmail.com ?

Thank you.