On Google Workspace, to allow a User to send an email on behalf of a group (like allowing Sully Syed to send an email from [email protected]), do the following:
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Go to Gmail on the web ( https://mail.google.com/mail/u/0/#inbox ) and log in.
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Click the gear icon in the upper-right and then click See all settings.
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Click Accounts and in the Send Mail As section, click Add another email address.
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Enter the name “yllus.com Information” and email address [email protected], leave Treat as an alias checked, and click Next step.
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Click the Send Verification button to receive an email confirmation. This message will go to the Group and thus your inbox.
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Click the verification link, and click the Confirm button when prompted.
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With that all done, do a hard refresh (F5 / Ctrl-R) to reload Gmail. Then start composing an email; you’ll notice you can select either your Gmail account or your Google Group email address as the sender in the From field. This also works when replying to incoming emails.
Source: Sending from a Google Group address in Gmail – Technology Help