You need to reduce size of PDF files before attempting to send them, since your email account probably has an attachment size limit, and even if yours doesn't, your recipient's may. In addition, large PDF files take a long time to upload.
PDFFab PDF Compressor comes with compression capabilities that will help you reduce PDF size, at the same time making sure that the original quality is preserved. It's able to batch compress PDF, TIFF, JPEG and other file formats at one time, and merge single or multi-page files to multi-page PDF documents. It also removes bookmarks, text annotations, PDF forms, PDF layers and article threads, which lets you obtain important savings in bandwidth costs, digital storage costs and network transmission times.