Upload the leads
A CSV, TSV, TXT or XLSX export from your lead source, or paste the list.
For sales and cold email
Email verification for cold email, before outreach.
A cold email sequence is only as good as its list. Flaxxa Mailcleaner checks each prospect's address before it goes into a sequence, labels catch-all and role addresses honestly, and audits the domain you send from.
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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
- Lead lists in one upload
- Bulk
- Labelled, not passed
- Catch-all
- info@ and sales@ flagged
- Role
- SPF, DKIM, DMARC
- Audit
01 / 04
Why do cold email lists bounce so much?
Prospect data goes stale fast: people change jobs, companies change domains, and guessed or scraped addresses were never real. Business domains are also often catch-all, so a weak verifier calls every address valid.
Outreach domains are sensitive to bounces. A few bad sequences can push a domain's mail into spam for everyone you contact.
02 / 04
How do you verify a lead list before a sequence?
Verify
Standard checks test the mailbox and catch-all behaviour for every address.
Sort by verdict
Send to valid first, hold catch-all for smaller batches, drop invalid and disposable.
Export
Download the clean list and load it into your sequence tool.
03 / 04
What should you remove from a cold email list?
- Invalid: the mailbox or domain doesn't exist.
- Disposable: throwaway inboxes nobody reads.
- Abuse: addresses that complained before.
- Usually role addresses, which reach a team rather than a buyer.
- Treat catch-all and risky addresses with care rather than removing them all.
04 / 04
How do you protect your outreach domain?
Verification keeps bounces down; authentication keeps trust up. Run the Flaxxa Mailcleaner domain audit on your outreach domain to check SPF, DKIM and DMARC and copy the records to add, then run the mail server test to see its grade.
What you'll use most
Mailcleaner capabilities that matter to sales and cold email
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.
Catch-all detection
Find catch-all (accept-all) domains in your email list. Flaxxa Mailcleaner tests each server, scores catch-all domains and never passes them off as valid.
Domain checks
Check your domain's SPF, DKIM, DMARC, BIMI, MTA-STS and TLS-RPT records, see Gmail and Yahoo requirements, get DNS fixes and test your mail server.
Other audiences
Flaxxa Mailcleaner for other industries
Flaxxa Mailcleaner for SaaS
Stop fake and mistyped sign-ups: check addresses on your form, block disposable inboxes, fix typos like gmial.com and verify users through the API.
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 sales and cold email: common questions
Lead lists often contain addresses that no longer exist. Bounces from a sequence hurt the reputation of your sending domain, so the next sequence lands in spam.
Get started in minutes
See Flaxxa Mailcleaner in your own workspace.
Spin up a workspace tailored to sales and cold email.
Free plan · No credit card · Cancel anytime