To use the bulk email function to automatically insert the missing pieces into the email you MUST

FIRST

Select Template Missing

THEN

select the member category

Missing Parts Today OR All Missing Parts see picture below

otherwise the [missing] bookmark will not work.

Other bookmarks that can be used in the Bulk Email function can be found here, note that not ALL the bookmarks that are in the automatic processes are available in the bulk emailing function.

Once you have selected the Member Category and the Template, select the members to send the email by ticking them

then scroll down to the bottom of the page and press the Send EMail button

It is always a good idea to send the email to yourself, or create a Library Membership (AAA Toy Library with Toy Library email address) to test the process before sending a bulk email. If sending a missing pieces email then create a test missing piece on your membership account or the toy library membership account.