Below is a list of the most common SPF include mechanisms used by third party email service providers.
Amazon
include:amazonses.com
Google
include:_spf.google.com
Mailchimp
include:servers.mcsv.net
Mailgun
include:mailgun.org
Mandrill
include:spf.mandrillapp.com
Microsoft Office 365
include:spf.protection.outlook.com
Mimecast
include:_netblocks.mimecast.com
Postmark
include:spf.mtasv.net
Salesforce
Include:_spf.salesforce.com
Sendgrid
include:sendgrid.net
Zendesk
include:mail.zendesk.com
Zoho
include:zoho.eu
Single include SPF record example:
| v=spf1 include:amazonses.com ~all |
The above SPF record indicates that only Amazon is authorized to send emails on behalf of your domain.
Multiple includes SPF record example:
| v=spf1 include:mailgun.org include:_spf.google.com include:spf.protection.outlook.com ~all |
The above SPF record indicates that Mailgun, Google and Microsoft are authorized to send emails on behalf of your domain.