[bigiain]

> We don’t sell any data.

Not only do I have zero reason to trust you when you say that (because every person planning on selling my data ways the same thing).

But I also have zero reason to trust you're skilled or resourced enough to adequately secure my data (or have sufficient motivation to do so).

And I also know that one day you'll likely sell your SAAS, and will have no control over what the people you sell it to will do.

If you've got enough traction that people are willing to jump through minor disposable email address hoops to use your product for longer than the free trial, but not enough traction to convince them to pay for it, I reckon you'd be better off building more features that add value and reconsidering your free trial plan - instead of devoting any dev effort into rejecting disposable emails.

[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.