Sending Services Directory

The Sending Services Directory is a searchable reference of SPF and DKIM configuration settings for popular email sending services. Use it to find the exact SPF include and DKIM selector for each service you use, with step-by-step setup instructions.

Tool URL:/tools/services

What does the directory contain?

The directory lists 15 email sending services across four categories:

  • Productivity — Google Workspace, Microsoft 365
  • Email Marketing — Mailchimp, Klaviyo, Brevo, Constant Contact
  • Transactional — SendGrid, Mailgun, Postmark, Amazon SES, SparkPost
  • CRM / All-in-one — HubSpot, Salesforce Marketing Cloud, Zoho Mail, ActiveCampaign

Each service page shows the SPF include value, the DKIM selector, and a numbered setup guide.

How to use the directory

Step 1 — Find your email service

Open the Sending Services Directory at /tools/services.

You can find your service in two ways:

  • Search — Type the name of your service in the search box at the top of the page. Results filter as you type.
  • Browse by category — Click one of the category filter buttons (All, Productivity, Email Marketing, Transactional, CRM / All-in-one) to narrow the list.

Click the card for your service to open the detail page.

Step 2 — Review the SPF include

The service detail page shows the SPF Include value, for example: 

include:_spf.google.com

This is the mechanism you need to add to your domain's SPF record to authorize that service to send email on your behalf.

Click Add to SPF record to open the SPF Generator with this include pre-loaded. You can then add any other services you use and generate your complete SPF record.

Some services (Klaviyo, HubSpot, Salesforce Marketing Cloud, ActiveCampaign, Brevo, SendGrid) do not have a standard public SPF include. These services require you to copy the specific DNS records they provide in their own dashboards. The setup steps on the service page explain how to do this.

Step 3 — Note the DKIM selector

The DKIM Selector shown on the service page is the identifier used to look up the public DKIM key in DNS. You will need this selector when verifying your DKIM setup using the DKIM Checker.

For example, Google Workspace uses the selector google, which means the DKIM record lives at google._domainkey.yourdomain.com.

Click Verify DKIM record to open the DKIM Checker with this selector pre-selected.

Step 4 — Follow the setup steps

The Setup Steps section on each service page provides numbered instructions for completing the email authentication configuration. These steps guide you through:

  • Where to find the authentication settings in your service's admin panel.
  • Which DNS records to add to your domain.
  • How to verify the setup in the service's interface.

Follow the steps in order. After completing the DNS changes, allow up to 48 hours for propagation before verifying.

Step 5 — View official documentation

Each service page includes a link to the service's official documentation at the bottom. If the setup steps seem outdated or your service's interface has changed, the official docs are the authoritative reference.

Using the directory with the SPF Generator

The Sending Services Directory integrates directly with the SPF Generator. When you build an SPF record in the generator, the preset buttons at the top of the mechanism builder correspond to services listed in this directory.

Clicking a service preset in the SPF Generator is equivalent to adding the include: value shown on that service's directory page. This saves you from having to look up each include value manually.

The SPF Generator only shows presets for services that have a known public SPF include. Services without a public include (those that require custom DNS records from their dashboard) are not shown as presets.

Common questions

My service is not in the directory. What do I do?

Search for "[service name] SPF include" or "[service name] DKIM setup" to find the information from the service's own support documentation. Once you have the values, add them manually in the SPF Generator (for SPF) or use the DKIM Checker with the selector your provider gives you.

Do the setup steps cover creating DNS records at my registrar?

The steps explain what DNS record to add (the type, name, and value). The exact process for adding records varies by DNS provider (GoDaddy, Cloudflare, Namecheap, etc.). If you are unsure how to add DNS records at your registrar, search for "[registrar name] how to add TXT record" for provider-specific instructions.

How current is the information in the directory?

The directory is maintained by the DMARC Examiner team and updated when providers change their authentication requirements or interface. If you notice something is out of date, use the official documentation link on each service page for the most current information.

I use multiple services. Do I need an entry for each one?

Yes. Every service that sends email on behalf of your domain needs to be covered by both SPF (via an include) and DKIM (via a DNS record). Use the directory to look up each service, then use the SPF Generator to build a single SPF record that includes all of them.

Related tools