Sending mail from a Google distribution group

If you are a member of a Google distribution group, in addition to receiving mail sent to the group, you can also send mail from the group address. Here's how to set that up in the Google web mail client.

Go to mail.google.com and login as your primary user
In the upper right section, click the Settings gear

and then click the See all settings button under Quick settings
In the top menu bar, click Accounts
Under Send mail as, click the Add another email address link
You'll see a yellow popup. Enter the distribution group address in the Email address box, leave the box next to Treat as an alias checked and click Next Step
Click Send verification
You will receive a verification code by email (sent to your distribution group address). Enter that code into the box and click the Verify button
You will now see your distribution group address as one of your Send mail as options
When you compose an email, you will see that address as an option in the From address