Please don’t send a large e-mail attachment without the recipient’s approval or prior knowledge. You don’t want to annoy someone because their computer is inoperable while they wait for your file to download. It’s also possible they don’t have the computer software to open your attachment, which can be very frustrating.
Before sending the attachment, contact the recipient and ask them if you can send a file, the size of the file, and the format of the file. They may ask you to delay sending it, send it in several e-mails if possible, or suggest an alternate format.