Authenticate every service that sends as you
Every service you send mail through has to be set up so it passes SPF, DKIM and DMARC. These guides show you exactly how - one sender at a time.
Pick your sender
Find the service below and follow its guide. Not sure who’s sending as you? DMARCER identifies every sender from your DMARC reports.
Business email
Google Workspace →
Add include:_spf.google.com, set up DKIM, and pass DMARC.
Microsoft 365 →
Add include:spf.protection.outlook.com, set up DKIM, and pass DMARC.
Zoho Mail →
Add include:zoho.com, set up DKIM, and pass DMARC.
Transactional & developer
SendGrid →
Add include:sendgrid.net, set up DKIM, and pass DMARC.
Amazon SES →
Add include:amazonses.com, set up DKIM, and pass DMARC.
Mailgun →
Add include:mailgun.org, set up DKIM, and pass DMARC.
Postmark →
Add include:spf.mtasv.net, set up DKIM, and pass DMARC.
SparkPost →
Add include:_spf.sparkpostmail.com, set up DKIM, and pass DMARC.
Email marketing
Mailchimp →
Add include:servers.mcsv.net, set up DKIM, and pass DMARC.
Klaviyo →
Authenticate via CNAME / DKIM, and pass DMARC.
Brevo (Sendinblue) →
Authenticate via CNAME / DKIM, and pass DMARC.
Constant Contact →
Authenticate via CNAME / DKIM, and pass DMARC.
ActiveCampaign →
Authenticate via CNAME / DKIM, and pass DMARC.
HubSpot →
Authenticate via CNAME / DKIM, and pass DMARC.
Support & helpdesk
Zendesk →
Add include:mail.zendesk.com, set up DKIM, and pass DMARC.
CRM & sales
Salesforce →
Add include:_spf.salesforce.com, set up DKIM, and pass DMARC.
Don’t see your sender yet? We’re adding guides all the time – and a full free check will still find and grade every service sending as you, whether it has a guide here or not.
See who’s really sending as you
Run a free check to find every sender on your domain – then authenticate each one with these guides.
Check your domain