Use Case

Validate at Signup. Skip the Confirmation Email.

Double opt-in kills conversion rates. But without it, fake emails flood your database. Truelist lets you validate emails at the point of entry — real-time, invisible to the user — so you get clean data without the friction.

bolt Under 200ms validation.: Fast enough to validate on blur or form submit. Users never notice the check happening.
block Block fakes at the door.: Catch disposable emails, typos, non-existent domains, and dead mailboxes before they create an account.
trending_up Higher activation rates.: When every signup has a real email, your welcome sequence actually lands. No more sending onboarding emails into the void.

Start your free trial

No credit card required

Full name

Work email

Company

Real-time validation Powered by Truelist

The double opt-in tradeoff

Double opt-in is the standard answer to fake signups. But it comes with real costs.

trending_down 20-30% drop-off: Studies consistently show that 20-30% of users who sign up never complete the confirmation step. That's real revenue walking out the door.
schedule Delayed activation: Users who do confirm often do it hours or days later — long after the signup momentum is gone. First impressions happen once.
mail Confirmation emails go to spam: The irony: confirmation emails themselves can land in spam or promotions tabs, especially for new sending domains. The gate designed to help can block legitimate users.
support_agent Support overhead: "I never got the confirmation email" is a top-tier support ticket. Resending, checking spam folders, troubleshooting — it all adds up.

What gets blocked at signup

Every validation checks for multiple risk factors in a single API call.

check Disposable/temporary emails (tempmail, guerrilla mail, etc.)

check Typos in common domains (gmial, yaho, hotmal)

check Non-existent domains and dead MX records

check Invalid mailboxes that will hard bounce

check Role-based addresses (info@, admin@, support@)

check Known spam traps and honeypots

How it works

User enters email: On your signup form, newsletter opt-in, or account creation page.
Truelist validates instantly: A single API call checks syntax, domain, mailbox existence, and disposable status in under 200ms.
Clean data from day one: Valid emails proceed. Invalid ones get a helpful error. No confirmation email needed.

Better signups start today

Get your API key in 30 seconds. No credit card required.

Start verifying for free View pricing

Frequently Asked Questions

Can't find the answer you're looking for? Reach out to our support team.

Does this replace double opt-in entirely?: For most use cases, yes. Real-time validation catches the same problems double opt-in solves (fake emails, typos) without the conversion hit. Some industries with strict compliance requirements may still want both.
Will users see a delay when signing up?: No. Validation completes in under 200ms — fast enough to run on blur (when the user tabs to the next field) or on form submit without noticeable delay.
What if the API is unreachable?: We recommend failing open — accept the email and validate it asynchronously. Our uptime is 99.9%+, so this is a rare edge case.
Can I use the selective checks feature for faster validation?: Yes. You can run just the fast checks (syntax, MX, disposable, role) which complete in under 5ms, and defer the slower SMTP check to a background process. This is ideal for signup flows where latency matters most.
How does pricing work?: Truelist offers flat monthly pricing — validate as many emails as you need without per-email charges or credit management.