1. When setting up additional domain emails for free in gmail, our mail server is cp02-wa.privatesystems.net (mail.domain.com does not work anymore for some reason).
2. in GSuite, my domain is partopia.ca, so when I went to add info@tawaftours.ca as an additional mailbox cause I didn’t want to create a tawaftours@gmail.com account, it allowed me to receive emails but said sending emails is blocked cause the tawaftours domain is different from partopia.ca
3. The way to unblock the sending emails is to follow those few steps in that guide and unblock other domains from the settings
Functionality not enabled: Add another email address that you own. – Gmail Community
