Catch malformed addresses and domain failures.
Deliverability & customer communication
Catch address problems before the first send.
Give customers a chance to correct an unreachable address at signup. Combine validation with confirmation, retries and delivery feedback throughout the customer lifecycle.
Confirm the destination and permission.
Review bounces and suppress failed destinations.
Separate address problems from sending problems.
A malformed address, a nonexistent domain or an explicit Null MX record can make delivery fail before a mailbox is involved. Other failures depend on recipient availability, quota, provider policy or sender reputation. Validation helps with specific causes; it cannot guarantee delivery.
More about Separate address problems from sending problems.
An MX record identifies mail routing for a domain. It says nothing certain about an individual mailbox. A domain without MX may still accept mail through an implicit A or AAAA route. Handle that distinction before rejecting a customer’s address.
Build the check into the lifecycle.
- Validate new and changed addresses before saving them as contact destinations. Keep technical validity separate from permission to send.
- Ask users to fix definitive syntax or routing failures and to approve any suggested spelling change.
- Retry temporary DNS failures with bounded backoff. Preserve an unknown result when the check cannot finish.
- Confirm inbox control for account recovery, important notifications and subscription workflows.
- Consume delivery and bounce events from your sending provider. Suppress hard-bouncing destinations and stop repeated attempts according to your policy.
- Reconfirm stale customer details at a sensible point in the relationship; an address can stop working after a successful check.
Treat mailbox probing as a point-in-time signal.
An SMTP recipient check can ask whether a server accepts a recipient without transmitting the message body. Catch-all servers may accept every recipient. Greylisting, blocking and anti-enumeration behaviour can leave genuine mailboxes unconfirmed.
More about Treat mailbox probing as a point-in-time signal.
The Maail analysis contract disables SMTP checks by default and requires explicit enablement and operational review. A result of accepted is not a delivery receipt, an identity check or a guarantee of inbox placement. Never turn a timeout into a claim that the mailbox does not exist.
Measure the outcomes you can improve.
Track hard-bounce rate, confirmed-address rate, correction success and false rejections by signup source. Review temporary-failure retries separately from invalid inputs. Use your own baseline; avoid relying on an invented universal reduction percentage.
More about Measure the outcomes you can improve.
Sender authentication, list permission, sending volume and complaint handling matter too. Use SPF, DKIM and DMARC diagnostics to investigate your sending domain alongside address validation.
Common questions
Can email verification eliminate bounces?
Verification can catch some address and domain problems before sending. Mailboxes and provider policies change, so delivery feedback, suppression and permission-based sending remain necessary.
Does no MX record always mean an invalid address?
SMTP permits fallback to A or AAAA records when a domain has no MX record. An explicit Null MX is different: it states that the domain accepts no email. DNS errors and timeouts need their own handling.
Will a valid result guarantee inbox placement?
A valid technical result does not guarantee delivery or inbox placement. Sender reputation, authentication, content, receiver policy and mailbox state affect the eventual outcome.
Email Verification for Gated Content & Whitepapers
Catch address mistakes at the download form and give interested readers a clear route to your content. Apply your own policy to disposable and shared inboxes.
Explore the guideEmail Validation for One-Field Newsletter Signup
Let readers subscribe with their email address. Catch input mistakes early, then collect preferences when there is a good reason to ask.
Explore the guideAcademic Email Checks for Education Discounts
Use an academic email as a low-friction starting point for education discounts, with a clear fallback when the address alone cannot establish eligibility.
Explore the guideGive every address a clear next step.
Discuss your form, address-quality rules and integration scope. Endpoint availability and enabled checks are confirmed during onboarding.