OneSignal's Email Messaging requires the use of a third-party email service provider to handle email delivery. All you have to do is set up the integration between the provider and OneSignal, and you'll be ready to send emails through OneSignal.
Mandrill is the transactional email service offered by Mailchimp. To set up Mandrill, you must first create a Mailchimp account if you do not already have one.
Then, add Mandrill to your account. You must have purchased Email Blocks in the Monthly Transactional Email Plan section prior to using Mandrill for email.
Next, you will need to set up your domain so that it can send emails from Mandrill. Go to Settings -> Domains, enter in your domain, and click 'Add':
When your domain is added, click View DKIM/SPF Setup Instructions, which provides the appropriate DNS settings you will need to update your domain. You can also verify your domain by clicking View details and receiving an email to your domain.
Next, you will need to update your DNS records for your domain host. You can follow Mandrill's instructions to learn more.
Once you have set up your DNS records, it make take up to 48 hours to work. Mailgun will email you when your domain is verified.
Next, in Mandrill go to Settings and click 'New API Key'.
Next, name your API key something like
OneSignal API Key, and click 'Create API Key' when you are ready.
You will see your key was created successfully. Next, highlight the API key and copy it to your clipboard. Also note your SMTP Username here.
CAUTION! API Keys need to be secret
Your Mailchimp API Key is like a password. Keep it safe and do not share it.
In OneSignal, go to Settings > Platforms > Email
Next, you must configure your email settings. Select Mandrill as the provider, and paste in the API key and SMTP User you just copied in Step 2.
Add the name and email address that you want your emails to come from (you may override these when sending a message.
By default, Identity Verification is disabled, however we recommend using it. You can enable Identity Verification here if you can support it.
Since our API does a lot of communication between both platforms, you will likely need these permissions at the least:
Updated over 1 year ago