Standard Shared Hosting: Message/attachment size limits
Is there any limit to the size of attachments or email messages that I can send or receive?
Our email system has an upper limit of 100 MB on the total encoded size of any individual email message sent or received. Sending of email messages from WebMail is further limited to containing attachments totaling no more than 50 MB in raw size. Messages larger than this will be rejected and are really too big to be sent as email anyway and should be communicated via FTP or some other mechanism.