You can batch send your PDF files.

Publisher:	Lavians Inc.
Downloads:	1
Software Type:	Freeware, 0.00
File Size:	1953.12M
OS:	Windows All
Update Date:	19 June, 2014

To extract E-mail address from PDF content and use the address to send email automatically. Meanwhile, Lavians PDF Automail also can block certain E-mail address from being used. Especially, when PDF files contain E-mail addressed that will be excluded from a recipient's list, the feature will make you easy.
To determine any recipient by each outgoing file according to a user-defined CSV filename-to-email mapping. What you need to do is to type in filenames (from CSV file) and corresponding email addressed, and Lavians PDF Automail will do the rest.
To add e-mail recipients, CC, BCC and PDF documents of which the message subjects don't contain the part of the information of the text by using PDF document properties. Document properties can be author, title, subject and keywords.
To preview, edit and modify extracted email addresses, message text and subject.
To use your current e-mail client or SMTP Internet E-mail server. Both are ok.
As for your outgoing PDF documents' security, don't worry. To select outgoing PDF files with a Document Open and User Permission passwords, it is ok. And recipients needs to type in a Document Open password so as to view the content.
To choose multiple attachments to send the E-mail.
Freeware, so you can use it either personally or commercially for free.