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