About MailCheckr
Better decisions before the first send.
MailCheckr helps teams understand whether an email address is ready to receive mail. It brings the evidence into one clear result, whether you are checking a single address through the API or cleaning up a larger list.
A useful result should explain what was checked.
Some mail servers do not give a definitive answer. When the evidence is inconclusive, MailCheckr can return an unknown result instead of pretending to be certain.
What we check
Several signals. One decision.
Each check adds context to the final classification, so you can see why an address is deliverable, undeliverable, risky, or unknown.
Start with the basics
Syntax, mail records, disposable domains, and role accounts help identify obvious issues early.
Check the destination
SMTP mailbox checks and catch-all detection add evidence about how the destination server responds.
Put results to work
Use the API, dashboard, bulk uploads, and signed webhooks to fit verification into your workflow.