We generally operate a 20Mb limit for email message size. There is not much point in increasing this, as many other ISPs block messages that are larger than 20Mb.
If you wish to send and receive very large files then you should consider using a service like Google Drive. Please get in touch with us about Google products and services as we are an Authorised Google Reseller and can assist you at no cost.
Email was never intended or designed to be a large file transfer protocol.