Okay, to sum up and keep it simple for everyone, here are the facts.
You have acknowledged a close relationship with namebind in the past, but you say it was a bad partner and you ditched them and this is now history.
I have shown the archived whois for backorderzone.com as of 09 Sept 2011. At that time the domain name backorderzone.com was owned by namebind, so is appears that namebind actually did own backorderzone.
A cache of backorderzone.com as of October 2011:
http://web.archive.org/web/20120502110458/https://www.backorderzone.com/
The website was the same as it is today. So if I were to judge by the whois my impression is that namebind was more than a partner, it was the entity that was pulling the strings at the time. Or I am still missing something.
I am personally surprised that you decided to retain a brand that has been tarnished by the actions of namebind, with whom you say you cut ties.
As for Intrust domains, we are being told they are/were just a client, but they were important enough to have a turneykey management interface of their own with logo, hosted at BZ. Until yesterday there was a dedicated server and IP address that presumably was just for their own use. I must assume that there is no shortage of IP addresses or computers at your organization since you had forgotten about it, and did not bother to reclaim resources that allegedly haven't been used for a quite a while.
For the curious, this is a screenshot of the management interface that is no more:
Of course, every company may have to deal with bad clients at some point, but when those clients use your infrastructure to spam or defraud it becomes your problem too. Personally I would kick them out rather than sink with them or let them destroy my reputation. But money talks in this world, in this industry even more.
Just looking at the general patterns, two major spammers have come to you for their domain needs, and bellnames is always in the spotlight.
I have always wondered why BZ doesn't provide contact details on their website, just a phone number. Also, the phone number on MPI's website changed from a 719 area code to a toll-free number shortly after the connection was exposed in this thread. I believe somebody has been paying attention to this thread.
What I think is this: BZ would rather keep a low profile, and not show an obvious link with their owners (MPI). Or the other way round.
But now this is an open secret and they have no other choice than to acknowledge it.
Now on to MPI (
http://www.mpisoft.com/): earlier in this thread a poster pointed out at the use of unlicensed stock images. Their website is still cheesy today, for example if you look at this page:
http://mpisoft.com/methodology.php?t=confidentiality you can see it's a copy-paste from another website ("The India Development Center is fully protected externally and internally with secure and restricted access to all sensitive resources. Every employee is provided with an Identification card.").
While I wouldn't call it a serious crime, it doesn't give the impression of a trustworthy and professional company. It's just another red flag among so many. BZ/MPI doesn't pass the smell test for me.
In the end, it's all coincidences, errors of the past, bad clients etc abusing the good faith of honest service providers, like the CNM.com fiasco that was another unfortunate but selective error by intrust domains & epik.
As you can see a leopard cannot change its spots, and intrust domains will always stab you in the back when the stakes are high enough.
And Rob Monster/Epik is washing his hands of it, and turns a blind eye on what's happening at his registrar.
There is a cluster of shady entities out there, that use each other as an umbrella to confuse outsiders and skirt responsibility for their actions. Seriously, I think icann should police the registrars a little more. It is clear that some registrars are rogue and exist for the sole purpose of spamming, defrauding people, or selling fake pharma etc. Based on the present and the past, I am not convinced that BZ/MPI are qualified or mature enough to run a registrar let alone dozens of them. At the very least they are lacking the necessary ethics and sense of responsibility.
Everybody can make up his/her own mind, time will tell.