Hi @Emsanator, thank you for reaching out.
If you’re on v4.10 or earlier version, you can use this setting: https://docs.mattermost.com/administration/config-settings.html#enable-sending-team-invites-from.
If you’re on v5.0 or later version, you can use Advanced Permission (available in E10 and E20): https://docs.mattermost.com/administration/config-settings.html#policy.