Do you allow "disposable" email addresses?

In short, we blocked all disposable email addresses in our site.

So my product isn’t live yet, but I also plan to do the same as well. I used to work for a startup that heavily relied on internet traffic and learned that no data is better than bad data. In this case, I believe that these users utilizing disposable email addresses are “bad data”.

We experimented in the past to check registrations done using disposable email addresses. We started building list of such email providers and prevented them from signing up. (Thanks @chrisshennan for sharing the list)

Unfortunately, there are still people who want to game the system; at the same time, new domains, providers of disposable emails emerge regularly. So it is bit tricky.

We even deliberated about kind of people who used disposable emails and later converted as paying customers. We realised some people (very small in number) are wary of marketing emails.

• Someone who wants to avoid barrage of sales emails to official id
• Someone who is in early phase of evaluation of product/service and casually looking at it (may not have intention to buy in near future)

• Solution *
  Few of above cases are understandable. Unfortunately there is no easy solution here. Based on such cases mentioned above, we decided to provide good amount of product documentation so that interested person can get a sense of product offering, look at the videos, demo/webinars, etc. Again it is a trade-off depending on how many people are using disposable email addresses.

We reject them outright. We use ZeroBounce's great API to detect them at signup, and we simply refuse to go ahead until they use a non disposable address. We also filter 'free' addresses such as GMail, HotMail etc. - Those ones require a validation before we let them continue and log in to our app. Business domains are fine and get instant access with little fuss.

I'm about to start looking to adding notifications to https://checkmysite.io but I'm planning on using a service like https://www.mailboxvalidator.com/ to reject disposable email addresses.

In my case, the email address will be the initial means of providing notifications so there is no point in me accepting disposable email addresses that won't allow me to effectively provide these notifications.

I guess at some stage you would want to remove stale accounts (to keep the database clean / keeping data only as long as you need / GDPR) so allowing accounts with disposable email addresses would result in a higher amount of stale accounts.

Yeah it's weird we're getting fake emails as well.

We have a demo with no sign up required and they're still signing up later on with fake emails.

We don't have a plan yet to fix this.