It seems as of late, more and more problems are showing up with regards to email messages not going through, getting caught up in the outbox, or 'timing out' before completed. When checking on these problems (remotely) I am finding email messages, typically jokes that have been forwarded a few times already (fw: fw: fw) and the email has a 4.7mb file attachment!
Now even though you received that message okay, that certainly does not mean that it will leave your system okay! Depending on a number of things, the speed of your Internet, the amount of time your email program is set to leave the outgoing server open, and of course the amount of room your email account has available at the time.
What you can do is stop sending these as most people you send them to will probably already have it coming in from someone else, and if they don't then maybe point them to places like "youtube" where you can do some fancy searching for hundreds, if not thousands, of funnies to watch. Utilize your high speed connection for viewing video via streaming instead of plugging up your email mailbox with this sort of thing.