How to add a group email as an Alias (Send As permissions) for a user when the group does not allow public posts

1. We first need to allow public posts to the group in order to receive the confirmation code that will later be sent by Google to the group.

1. In a web browser, visit  https://admin.google.com and log in.
2. Click on Directory followed by Groups in the left navigation panel.
3. Locate the group in the list and click on it.
4. Click on Access Settings in the menu under the name and email of the group.
5. Click on Access Settings in the right panel to expand it.
6. Click on Publish Posts in the right panel to change it to check-boxes.
7. Click the check-box at the intersection of External and Publish Posts to place a check in it.
8. Scroll down to the bottom of the right panel and click Save.
9. Keep this browser tab open and on the same web page.
   
   

2. Next, we need to set the permissions of the group to allow Send As, or alias,  permissions.

1. Open a new tab in your browser and visit https://groups.google.com ensuring you're logged in as an owner of the group.
2. In the left navigation, select My Groups.
3. In the right panel, click on the name of the group.
4. At the bottom of the left navigation, click on Group Settings.
5. In the right panel, scroll down to Member Privacy and select "Anyone on the web" under "Who can contact group owners."
6. At the bottom of the page, click Save Changes.
7. Keep this browser tab open and on the same web page.
   
   

3. Now to add the alias to the Gmail account.

1. In your browser, open a new tab and visit https://mail.google.com and log in as the account you wish to add the alias to. 
2. Click the Gear Icon in the upper-right corner of the page followed by "See all settings."
3. Under the Settings header, click Accounts.
4. Under "Send mail as," click "Add another email address."
5. A new window will appear. Enter the email address of the group to be added.
6. Ensuring "Treat as alias" is selected, click "Next Step."
7. Click "Send Verification."
8. Switch to the Group Tab left open in Section 2 Step 7.
9. In the left navigation panel, click on Conversations followed by Approved underneath.
10. Click on the new email from Google which will be displayed as 'Your Org Name' - Send Mail as 'email of the group' and copy the Confirmation Code.
11. In the window that appeared in Step 5 of this section, paste the code and click verify.

4. The final process is to set the group back to not allowing public posts. This is not required if you wish to continue allowing people from outside of the organization to post to the group.

1. Return to the Google Admin tab left open in Section 2 Step 7.
2. Click the check-box at the intersection of External and Publish Posts to uncheck it.
3. At the bottom of the page, click Save Changes.