25 free cold emailand DNS tools.
Check a sending domain, clean and verify a list, test your copy and plan your sending. Free, no account needed.
What you can do
- Check a domainSPF, DKIM, DMARC, MX and blocklists
- Clean a listValidate, de-duplicate and suppress
- Test your copySubject lines, spam words, spintax
- Plan your sendingMailboxes, warm-up and send times
Nothing you paste is stored.
Deliverability and DNS.
Set up and check your sending domains, and find out why mail lands in spam.
Lead list hygiene.
Find, check and clean your lists before they cost you your domain.
Copy and campaigns.
Write emails that read like a person wrote them, and send them safely.
Planning and calculators.
How many mailboxes, how fast to warm them, and when to send.
Questions before you start.
Ask us on the chat if yours isn't here. A real person answers.
Are the tools really free?
Yes, all of them, with no account and no limit beyond a few checks a minute on the ones that look things up.
Do you store what I paste?
No. Most tools run entirely in your browser. The ones that check DNS, blocklists or domain age ask our server, which looks it up and stores nothing.
Can I use the results in mailzy?
Yes. Clean and check a list here, then import it into mailzy's Leads, or let mailzy check your domains and verify your lists for you.
Let mailzy do the checking for you.
Domains checked every day, lists verified, mailboxes warmed. Free for 14 days.