Adds new widget 'Subscribe Google Groups', that allows user to enter e-mail address she wants to get subscribed into admin-selected Google Group.
Behind the scenes plugin sends subscription e-mail to [email protected]
. If everything goes well, user gets notified for succesful operation. If WordPress detects error while subscribing, user gets error message.
If domain for the subscribing user has published strict SPF/DMARC policies, receiving domain might reject mail sent from invalid server (server hosting the WP site).
Also, see grep -RE "(TODO|FIXME)" .
.