The attachment limits is totally dependant on the email service you have with your domain name.

If you have Prime web hosting or any older hosting packages accounts using our shared cPanel server please see this Article What is the Email Attachment Limit for cPanel Email Accounts.

If you are using our Professional Email Service KartHostKloud^tm Mail service, please see this Article What is the KartHostKloud^tm Mail Email Attachment Limit? And limits at Other Email Providers.

If you are using any 3rd Party Email Service please check with the 3rd Party for their limits.