MailerSend Webhooks

When to Use This Skill

• How do I receive MailerSend webhooks?
• How do I verify a MailerSend webhook signature?
• Why is my MailerSend Signature header verification failing?
• Why won't my MailerSend webhook save / why does the URL validation fail?
• What is webhook.test and the test_Am3L1GuOIc4blLUuHqAPxxwkZaJyEk8G secret?
• How do I handle activity.hard_bounced / activity.spam_complaint events?
• How do I handle MailerSend SMS webhooks (sms.sent, sms.delivered, sms.failed)?

MailerSend, not MailerLite. MailerSend is the transactional email and SMS API from the MailerLite group (developers.mailersend.com). MailerLite (marketing email) is a separate product with a separate webhook scheme. This skill is not for Mailgun, Mailchimp or Resend either.

Verification (core)