[throwawayboise]

I signed up for a KVM hosting provider. They initially rejected my account because I used a "disposable" email address. Their experience is that use of disposable email addresses is highly correlated to use of their VM instances to send spam or carry out other hostile activities.

That explantion was acceptable to me; if it works for them. I might note that they only send me transactional email (statement of charges for the month) and no marketing.