Manages subscriptions to email lists. Simply add [-ggis-subscribe-] to your post.
ggis-Subscribe gives authors an easy way to insert a form that performs emailing list subscription management. Simply add [-ggis-subscribe-] to your post and it will create an email list subscription management form. Depending on the settings and parameters you choose, it will insert either a short form, just an email address box with submit button or a full management form.