| 1 Grid Hosting | DKIM | SPF |
| 20i | DKIM | SPF |
| Abnormal Security | DKIM | SPF |
| ActiveCampaign | DKIM | SPF |
| Adelante | No DKIM Support | SPF |
| Afrihost | DKIM | SPF |
| Amazon SES | DKIM | SPF |
| Apsis | No DKIM Support | SPF |
| AutoTask | DKIM | SPF |
| AWeber | DKIM | SPF |
| Benchmark Email | DKIM | SPF |
| Bitrix24 | No DKIM Support | No SPF Support |
| Braintree Payments | No DKIM Support | SPF |
| Bullhorn | DKIM | SPF |
| Campaign Monitor | DKIM | SPF |
| Chargebee | No DKIM Support | No SPF Support |
| Check Point Harmony Email (Avanan) | DKIM | SPF |
| Clikit Media | DKIM | SPF |
| ClubHouse Online | DKIM | SPF |
| Emma | DKIM | SPF |
| Everlytic | DKIM | SPF |
| Flowmailer | DKIM | SPF |
| Flywheel | DKIM | SPF |
| Freshdesk | DKIM | SPF |
| FreshSales | DKIM | SPF |
| FreshService | DKIM | SPF |
| Google Workspace | DKIM | SPF |
| HubSpot | DKIM | SPF |
| Inky Phish | DKIM | SPF |
| Keap (Infusionsoft) | DKIM | SPF |
| Kinsta Hosting | DKIM | SPF |
| Klaviyo | DKIM | No SPF Support |
| KnowBe4 | DKIM | SPF |
| MailChimp | DKIM | SPF |
| MailGun | DKIM | SPF |
| Mailjet | DKIM | SPF |
| Mandrill | No DKIM Support | SPF |
| Marketo | DKIM | SPF |
| Mesh Email Security | No DKIM Support | SPF |
| Microsoft Exchange Online/Office365 | DKIM | SPF |
| Mimecast | DKIM | SPF |
| MXVault by Global Micro | DKIM | SPF |
| N-Able Mail Assure (SolarWinds Spam Experts) | DKIM | SPF |
| Netwide SPF Setup | No DKIM Support | SPF |
| Ortto (Autopilot) | DKIM | SPF |
| Perception-Point Advanced Email Security SPF (Acronis Advanced Email Security) | No DKIM Support | SPF |
| Plesk | DKIM | SPF |
| Postmark | DKIM | SPF |
| ProofPoint Essentials | DKIM | SPF |
| Rackspace | DKIM | SPF |
| Salesforce | DKIM | SPF |
| Sendgrid | DKIM | SPF |
| Sendinblue | DKIM | SPF |
| Shopify | DKIM | SPF |
| SMTP2GO | DKIM | SPF |
| Sophos | DKIM | SPF |
| Spam Titan(TitanHQ) | DKIM | SPF |
| Spice Works | No DKIM Support | SPF |
| Synaq Secure Mail | DKIM | SPF |
| Trend Micro Email Security | DKIM | SPF |
| Trend Micro InterScan Messaging Security DKIM Signature | DKIM | SPF |
| Trustwave MailMarshal DKIM Setup | DKIM | SPF |
| Xneelo | DKIM | SPF |
| Zendesk | DKIM | SPF |