Google Workspace:

include:_spf.google.com

Microsoft 365:

include:spf.protection.outlook.com

Zoho Mail:

include:zoho.com

Mailgun:

include:mailgun.org

Zendesk:

include:mail.zendesk.com

Amazon SES:

include:amazonses.com

Rackspace:

include:emailsrvr.com

GoDaddy:

include:secureserver.net

Fastmail:

include:spf.messagingengine.com

SendGrid:

include:sendgrid.net

Maijet:

include:spf.mailjet.com

AWeber:

include:send.aweber.com

MailerlLite:

include:_spf.mlsend.com

MailChimp:

include:spf.mandrillapp.com

Sendinblue:

include:sendinblue.com

Marketo:

include:mktomail.com
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