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A NeverBounce alternative for a better first email.

Check recipient addresses, test the message and investigate delivery. MailSlurp connects email verification with the checks around your next send.

Envelope and custom-domain email address symbols

Trusted by teams at

  • Broadcom
  • Scraper
  • Trivago
  • Avast
  • Wolt
  • Panasonic
  • Broadcom
  • Scraper
  • Trivago
  • Avast
  • Wolt
  • Panasonic

Catch address problems before they become missed messages.

Check email addresses at signup, during a contact import or before an important send. Review syntax, domain and mailbox-related findings, then decide which records to accept, investigate or reject.

Explore email verification
Email envelopes representing the recipient addresses to check
Envelope, domain globe and address symbol

Check at signup

Catch mistakes while the person entering the address is still there to correct them.

Multiple email envelopes representing a contact list

Review imported contacts

Screen a list before sending and keep uncertain records visible for a closer look.

SDK and API artwork for application-specific handling

Make the rule fit the message

Use the findings to set your own handling for account recovery, invoices and campaign contacts.

Go from a checked address to a tested journey.

A valid address is one part of a working email flow. Use a controlled MailSlurp inbox to test the signup, reset or receipt and inspect the message your application actually delivered.

Test the complete email flow
Email output across phone and desktop clients

Check the sender as well as the list.

Pair recipient checks with inbox placement testing and domain monitoring. See where a test campaign lands and investigate SPF, DKIM, DMARC or blocklist findings when delivery changes.

Test campaign placement
Provider-specific inbox and spam placement illustration

How to add verification to your workflow

Choose the checkpoint

Check an address when it is entered, recheck contacts during an import or verify a list before a high-value send. Use the email validation API for repeat checks.

Review the findings

Separate clear errors from uncertain results. Decide which records need correction or review rather than treating every result as a yes-or-no promise of delivery.

Test the email that follows

Confirm the message flow in a controlled inbox and run a placement test for campaigns. Address quality, message content and sender reputation answer different questions.

Catch the address mistake while the customer can fix it.

Put verification at the signup checkpoint

Evaluate MailSlurp with the addresses your signup form receives. Check clear syntax or domain errors and decide which uncertain results need review. Keep the correction close to the form so a person can fix a typo before waiting for a confirmation that will never reach them.

Test the confirmation after the address check

Use a controlled inbox to complete the signup flow and inspect its verification message. Check the recipient, code or link and final application state. This connects the address decision with the customer action your team actually needs to work.

Questions before you switch?

How do I combine address verification with a signup test?

Use verification when the address is entered so a person can correct a clear mistake. Apply your own handling for uncertain findings. In your automated test, use a controlled MailSlurp inbox, request the confirmation email and complete its link or code. This checks both the address decision and the application action that follows it. Test the signup confirmation.

Can I check addresses through an API?

Yes. Add MailSlurp verification to signup, contact import or pre-send workflows through the API. Review the findings and apply acceptance rules that fit the message and its importance.

Is address verification the same as inbox placement testing?

They answer different questions. Verification checks the recipient address. A placement test sends a message through your real provider and records where it lands in controlled test mailboxes.

Give the next send a better starting point.

Check addresses and test the email that follows.

Domain authentication checks to complement recipient verification