Mailgun integration with Salesforce


To get Salesforce to send emails using Mailgun, you’ll need to have the following in place:

  • If you don’t already have an account, create one at
  • Be sure to follow the DNS configuration guidelines at
  • Create an account for SMTPRelay

Getting started

Log in to Mailgun and create smtp credentials for a Salesforce sender account (you can use your own or existing credentials, but it’s better to have separate usernames/passwords):

Go to and click Manage SMTP credentials.

Mailgun credentials menu

Click New SMTP Credential
Enter a username and create a password. For the username, we’d recommend something like [email protected].Click Create Credential.

Mailgun new credential

You have just created an SMTP login for Mailgun. We will be using these credentials to configure SMTPRelay.

Log in to SMTPRelay, and go to your services list:

Click Add a New Relay and enter the Mailgun smtp credentials. Enter your salesforce orgId. You can find the orgId by logging in to salesforce. Its under Setup, Company Profile, Company Information. It’s the 15-character code under Organization ID.

salesforce orgid

After you click Save, e will automatically validate the authentication settings. If everything is ok, the control panel will show you how to configure Salesforce.

In Salesforce, go to SetupEmail Administration, Email Relay Activation. Enter the following:

salesforce relay settings

  • Email Host:
  • Port: 587
  • TLS Setting: “Preferred”
  • Uncheck “Restrict Relay To Domains”
  • Check Active

Click save.

You might notice a warning about using a relay in combination with bounce management. Mailgun will take care of this. In Salesforce, go to SetupEmail Administration, Deliverabiliy. Uncheck the following options:

  • Uncheck “Activate bounce management”
  • Uncheck “Enable compliance with standard email security mechanisms”

Finally, click save.

You should now be able to send a test message from Salesforce. It should be delivered and show up in your Mailgun console. If it is not delivered to your mailbox, but does show up in Mailgun, please check your Mailgun and DNS configuration.