How do I utilize SPF?

This document sets out some basic info on how to integrate our DNS and Dyn Email services with SPF (Sender Policy Framework). For more info on SPF, vist http://www.openspf.net/.

Please note that Dynamic DNS hosts do not support the creation of TXT records, and at this time we do not have any plans to change this.

Dyn Standard DNS

Dyn Standard DNS provides support for SPF via the creation of TXT records in both the ”Expert” and “Standard” interfaces.

If your Dyn Standard DNS zone is configured to use the “Standard” interface (the default), while viewing your zone click the “Add New TXT Record” link and enter:

Host: <blank>
Data: "v=spf1..."

If you are instead using the “Expert” interface, in the Add New Record section, enter the following content:

Host: <blank>
TTL: 60
Type: TXT
Data: "v=spf1..."

Note that the content in the Data field needs to be enclosed in quotes as shown above.

Dyn Standard SMTP

Customers using only our Dyn Standard SMTP service to send mail for their domain may want to add an SPF record for their domain listing our server as permitted to send mail for their domain.

"v=spf1 include:outbound.mailhop.org ~all"

This will let you piggy back on the SPF record which we in turn publish for outbound.mailhop.org.

Dyn Email Gateway and Backup MX

Customers using our Dyn Email Gateway or Backup MX services and who have setup SPF testing on their end, will want to configure their systems to “skip” our servers.

In order to maintain the reliability of the Dyn Email service, it may (will) be necessary to add/move machines providing this service from one location to another. As such, we can not (and will not) provide a list of IP addresses which will used in providing this service.

The only thing we can promise with respect to this service is that all mail will be delivered from IP addresses which have proper reverse and forward DNS within the mailhop.org domain.

Please see the documentation for your MTA and /or SPF implementation for info on how to skip IP addresses when performing SPF tests.

Dyn Email Forward

We have no plans to implement SRS (Sender Rewrite Scheme) in Dyn Email Forward at this time. As a result, if you are forwarding mail to a domain that has implemented SPF filtering this may prevent you from receiving some mail sent through this service.