If you have a Hostko hosting account using the Shared or Reseller web hosting plans, there is a limit of 50MB for email attachments.
Please note that this 50Mb limit is for the complete email message, including attachments.
If you wish to send and receive very large files then you should consider using a service like https://wetransfer.com/ (external link opens in a new window) or a cloud-based filing sharing service like DropBox or OneDrive.
Email was never intended or designed to be a large file transfer protocol.