Should your website block disposable email addresses?
We run a temporary email service, so you know where we stand. But there are real reasons to block disposable addresses in some places, and good reasons not to in others.
What blocking actually stops
- The same person claiming a free trial or welcome offer many times.
- Bulk fake accounts for spam, fake reviews, or vote manipulation.
- Accounts nobody can contact later, which lead to support tickets when a password is lost.
What it costs you
- People who care about privacy leave rather than hand over their real address.
- Blocklists make mistakes. Small email providers, new company domains, and forwarding services sometimes end up on them.
- People who are turned away often come back with a throwaway address on a normal provider, so you lose the signal without stopping them.
- Lists need keeping up to date as new domains appear.
How blocking works
Most sites compare the domain after the @ against a list of known disposable email domains. Open-source lists are available and updated by the community. Some sites add checks on the domain’s mail servers or its age, or pay a service that scores each address. Whichever you choose, show a clear message. Silently never sending the email leaves real users confused.
Where blocking makes sense
- Free trials with real costs, such as compute, credits, or shipped products.
- Sign-up bonuses, referral rewards, and anything else with money attached.
- Reviews, votes, and rankings, where one person must count once.
- Accounts that need a long-term contact, such as financial or regulated services.
Where it usually doesn’t
Newsletters, content downloads, comment sections, and trying out a free tier rarely need it. A visitor using a disposable address there was never going to read your marketing. Blocking them mostly loses the visit.
Alternatives that target abuse
- Rate limits per IP address, device, and payment card.
- A bot check on sign-up.
- Ask for a permanent email only when it matters, for example when a trial converts to a paid plan.
- Limit what a brand-new, unverified account can do.
- Look for patterns across accounts instead of judging one address.
On our side, we enforce an acceptable use policy that forbids bulk accounts and abusing trials, and we take abuse reports.