From Remo Software:
Remo ZIP Free version lets you compress large sized files and folders by creating .zip, .rzip files on Mac OS X. It's a very powerful file compression tool, which offers 10 different compression levels starting from 'Super-Fast' to 'Best'. Thus, making it easier for you to store or transfer large sized files.
All email clients have set a size limit on the messages and restricts sending of such large size messages. If try to send messages with attachments larger than the assigned size limit, then the email client shows error message. The only solution to such issues is to compress large sized files before transferring them and Remo ZIP is the best app for compressing files on Macintosh.
By compressing files and folders you can, not only reduce the file size for data transfer but also will reduce the data transfer time and the risk of data corruption. Moreover, you can also reduce the storage space utilized for storing such large files and folders. With this tool you can also update existing .zip, zipx files, i.e. you can easily add a new file or delete an unwanted file.