I need to get a email address spammed so much they want to close the account down - any tips on how?
Having been the recipient of such spam on multiple occasions, I consider the senders of such to be scummy bottom feeders, I would encourage you to not become scum.
I have found that when people get mad at you because you are more successful then them and you won't either do work for them so they don't have to, or tell them all the secrets of your hard work, that they sometimes get mad at you and have the "well if you won't help me succeed then you shouldn't succeed either".
Its been said by others better then myself before, but the basic premise is that there is no short cut to hard work.
Personally the only people on the planet to whom I would wish their email box flooded with spam is the people who have flooded mine with spam.
Also as noted above, your just going to light up their spam box. Outlook has great rule creation and there are some excellent spam plugins out there. On the server side, systems like gmail have great spam protection and options as well, and there are some great server side solutions for dealing with spam to self hosted addresses.
So you will waste their time and make them mad at you, but your not going to make someone want to close their mail box. If you wanted to make someone hate the address so bad that they wanted to close it, its probably possible, but the issue generally comes down to that would take so much hard work that the people that send such useless spam aren't willing to work that hard and consistently. And if they were, at some point they would realize that they could redirect their hard work and resources to succeeding and just do better for themselves.
Don't become a bottom feeder, find a way to channel that energy to do good. If you can't figure that out, then go volunteer at soup kitchen or homeless shelter, you will probably (hopefully) have a attitude change fairly quickly. The golden rule pretty well says it all.