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Create a widget token in Flaxxa Mailcleaner, on a plan that includes it.
For SaaS and sign-up forms
Email verification for SaaS that stops fake and mistyped sign-ups.
Fake and mistyped emails at sign-up mean welcome emails that bounce, trials that never activate and free plans claimed twice. Flaxxa Mailcleaner checks each address on your form or from your backend, blocks disposable inboxes and suggests fixes for typos.
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flaxxa.com / product / mailcleaner / use-cases
By industry
How teams use Mailcleaner.
Email marketers
Sales and outbound
Sign-up forms and SaaS
Agencies
- On your sign-up form
- Widget
- Blocked before submit
- Disposable
- Suggested to the user
- Typo fix
- For backend checks
- API
01 / 04
Why do SaaS products verify emails at sign-up?
Your sign-up form is where bad addresses enter. A typo means the welcome and password-reset emails never arrive and the user gives up. A disposable inbox means a trial that can't be reached and a free plan that can be claimed again tomorrow.
Every bad address also bounces your onboarding emails, and a high bounce rate on those hurts delivery for every user.
02 / 04
How do you verify emails on a sign-up form?
Add the script
Place it on your sign-up and lead forms, and list the websites allowed to use it.
Check as they submit
Invalid, disposable and abusive addresses are stopped; typos get a suggested fix.
Go deeper in the backend
Run a Standard check through the API before sending onboarding emails.
03 / 04
What does Flaxxa Mailcleaner check for SaaS sign-ups?
- Address format and typos of major providers, with the corrected address suggested.
- Known disposable domains, refreshed weekly from public blocklists.
- Role addresses such as info@ or admin@, flagged separately.
- Mail servers for the domain, and on Standard checks through the API, the mailbox itself.
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How does it fit the rest of your stack?
The API returns JSON with a verdict, reason and risk score, so your backend can allow, warn or block. Signed webhooks report bulk jobs when you re-check an existing user base, and the suppression list keeps hard-bounced addresses from being mailed again.
What you'll use most
Mailcleaner capabilities that matter to SaaS and sign-up forms
API and widget
An email validation API for single checks and batches of 1,000, file uploads and signed webhooks, plus a widget that checks addresses on your forms.
Disposable email checker
Check whether an email address uses a disposable (temporary) inbox, in a list or on your sign-up form, plus role addresses like info@ and sales@.
Email verification
Verify one email address or a whole list: a verdict, a 0–100 risk score and a confidence score for each, from a paste, a file, Google Drive or the API.
Other audiences
Flaxxa Mailcleaner for other industries
Flaxxa Mailcleaner for sales teams
Verify prospect emails before a cold email sequence: catch invalid, catch-all and role addresses, protect your sending domain and keep bounces low.
Flaxxa Mailcleaner for agencies
Email list cleaning for agencies: verify client lists before campaigns, re-check connected email tools on a schedule and audit client domains.
FAQ
Mailcleaner for SaaS and sign-up forms: common questions
Check each address at sign-up. The Flaxxa Mailcleaner widget blocks disposable and invalid addresses on your form, and the API lets your backend run a full check before creating the account.
Get started in minutes
See Flaxxa Mailcleaner in your own workspace.
Spin up a workspace tailored to saas and sign-up forms.
Free plan · No credit card · Cancel anytime