Although LL simply can't be bothered to do anything about it, it doesn't mean that we are powerless to do something instead.
For some reason, some but not all the emails have been forwarded to my email account. So what I did was sign up for a free SpamCop Account Then as each email comes in, I copy and paste the email with full headers into the reporting window on the Spamcop website. Press the process button and wait a few seconds.
You will then be given the option of Sending the Spam Report, to abuse@steadfast.net, abuse@sendgrid.com and abuse@softlayer.com. However, and this is important, because the emails actually come from LL's server make sure to un-check both abuse@steadfast.net and abuse@sendgrid.com. Make sure that only the abuse@softlayer.com box is checked otherwise LL could potentially be added to email blacklists, although it will probably definitely make LL wake up and listen, it isn't what we really want.
If enough people get these emails and report mmook.com for spamming, softlayer.com who hosts mmook.com will have to take action or risk being blacklisted.
Crypt.