Original Article – https://support.jungledisk.com/hc/en-us/articles/360013186613-Allow-external-senders-to-a-Gsuite-group
Google Groups is a great feature that can let you have an email address on your domain so that when someone sends an email to that address, several people will receive it. This will eliminate the need for setting up forwards for certain email that you need several people to get and/or not have to remember everyone’s email address to just send a communication out. A good example would be to send something out to your entire organization.
Google has 4 different kinds of groups that an admin can create in the admin console.
Public
Team
Announcement-Only
Restricted
The purpose of this article is to let you know and show you how to allow external senders to be able to send to the group that you create. By default, when creating any of the 4 groups, it will NOT have the ability for people outside of the organization to send to the email address you associate with it. This goes for a group that is created as “Public”. Weird, I know! This is a common issue and if not changed, you and your team can be missing out on important communications if you needed people outside of your organization to send to the group.
You can read up on the differences between the groups here.
Creating New Group
If you have not created a group yet and need to have one that anyone can send to, you can create a “Team” group and you will see the option to “Allow anyone on the internet to post messages”.
Group Already Created
If you have already created the group, you can simply click on the group in question and then click on “Access Settings”
One the next screen you would then find the “Posting Permissions” and on the drop down for “Post”, make sure to check “Anyone on the web”. Once you do that, make sure to click “Save” at the top. If you don’t click save then the changes will not be set.
Typically when this is changed, it will take about 10 minutes to propagate but more often than not, it takes a minute or two.