The Blogs settings category allows adjusting the following settings:
•Send blog e-mails from - e-mail address that will be used as the Sender ('From') address of notification e-mails.
•Enable blog post trackbacks - If checked, specified blog posts are pinged after the new blog post is saved; turn off this setting if you are creating your site on the production server to avoid creating trackbacks to your production server.
•Use external service for trackbacks - indicates if the external Scheduler Windows service should be used to process scheduled tasks which handle trackbacks.
•Blog unsubscription URL - URL of a page on which the Blog post unsubscription web part is placed; this is a special web part used for handling unsubscriptions from receiving notifications about new blog posts.
•Enable double opt-in for blog post comments - indicates if double opt-in should be enabled for blog post comments. When enabled, users are required to confirm their subscription by clicking a link that is sent to them in an e-mail.
•Double opt-in approval page path - path to the page that contains the Blog post subscription confirmation web part. The subscription confirmation link that will be sent to users will point to this page.
•Double opt-in interval (hours) - amount of time in hours, during which a user has to confirm their subscription request.
•Send double opt-in confirmation - indicates if an e-mail confirmation should be sent to user after they approve a subscription. If double opt-in is disabled, these confirmation e-mails are always sent.
Detailed information about the Blogs module can be found in Developer's Guide -> Modules -> Blogs.