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Blog unsubscription URL  | 
URL of a page containing the Blog post unsubscription web part, which is a special web part for handling usubscription requests for blog post notifications.  | 
Send blog e-mails from  | 
E-mail address of the blog comment e-mails sender. You can use also format ‘Someone<some@something.com>’  | 
Enable blog post trackbacks  | 
Indicates if trackbacks are enabled. The trackbacking feature enables you to add a comment about your new blog post to some other blog post automatically when you create the new blog post.  | 
Use external service for trackbacks  | 
Indicates if the external Scheduler Windows service should be used to process scheduled tasks which handle trackbacks.  | 
Detailed information about the Blogs module can be found in Developer's Guide -> Modules -> Blogs.