Ask before you send large attachments

There is nothing wrong with sending important large attachments. The point many people would'nt just open large attachments for fear of viruses. In addition, it also takes up much space in the recipients inbox folder. So, it is a good idea to include as much information (which is actually important) as possible in the body of your email. And if you find it unavoidable to send large attachements, ask the recipient before you send it.