I have a Google Apps account with two others approved "Send mail as" accounts. In the Gmail settings (web interface) I can set one signature for each of the three email addresses.
Is it possible to do the same through the Googe Apps Email Settings API so that I can automate this for the entire organization?
The API documentation (https://developers.google.com/google-apps/email-settings/#manage_signature_settings) does only mention how to define username, but gives no options for specifying the actual email address for that username to set the signature for.