When this happens...
MailgunNew Failed Delivery Event
Then do this...
SlackSend Channel Message

If an email does get delivered to your recipients you often want to know about it. This Mailgun Slack integration will post a message to Slack letting you know when emails from Mailgun aren't delivered.

How It Works

  1. A Mailgun email isn't delivered
  2. Zapier posts a message to Slack

What You Need

  • A Mailgun account
  • A Slack account

Why Zapier?


Get started for free—14 day trial of premium features and apps.


No coding required—automate any of 1,500+ apps in minutes.


Enterprise-level security—connect mission-critical apps.

It's easy to connect Mailgun + Slack and requires absolutely zero coding experience—the only limit is your own imagination.

When this happens...
then do this!
New Unsubscribe Event

Track Unsubscribe Events via Callback URL.

New Mailing List Member

Adds a new member to a mailinglist.

New Complaint Event

Track Unsubscribe Events via Callback URL.

Send Email

Send an email, via your Mailgun account.

New Open/Click Event

Webhook for Tracking Opens/Clicks.

Send Direct Message

Send a direct message to a user or yourself from the Slackbot.

New Bounce Event

Track Bounce Events via Callback URL.

Send Channel Message

Post a new message to a specific #channel you choose.

New Failed Delivery Event

Track Failed Delivery Attempts via Callback URL.

Add Reminder

Adds a reminder for yourself or a teammate, just like the /remind slash command.

Use our free platform to build a single Zapier integration and instantly connect your app with 1,500+ others.

Become a Zapier Integration Partner

Mailgun is a tool with powerful APIs that allow you to send, receive, track and store email effortlessly. Except, with Zapier you don't have to write any code!

Slack is a platform for team communication: everything in one place, instantly searchable, available wherever you go. Offering instant messaging, document sharing and knowledge search for modern teams.

See Slack Integrations