Mailing List Archive

> -----Original Message-----
> From: owner-spf-help@v2.listbox.com
> [mailto:owner-spf-help@v2.listbox.com]On Behalf Of Ludwig.Janine
> Sent: Tuesday, August 31, 2004 5:20 PM
> To: spf-help@v2.listbox.com
> Subject: [spf-help] SPF and subdomains
>
>
> Hello all,
>
> We are currently sending email from our domain (for corporate
> communication)
> and also from a subdomain (for legitimate email marketing). The
> email from
> our regular domain originates from a different IP address than the email
> from our subdomain. My question is, do I need to set up two SPF records,
> one for the main domain and another for the subdomain or can I just create
> one SPF record and include all IP addresses? What would you recommend?
>
Regardless of how you construct the records, there still have to be two.
One published at the domain level and one published at the sub-domain level.

You could do if several ways:

Publish an all inclusive record and the domain level and the identical
record in the subdomain.

Publish an all inclusive record and the domain level and a record at the
subdomain level that redircects to the main record.

Publish a record at the domain level that describes mail sent from the
domain and publish a record at the subdomain level that describes mail
sources for the subdomain.

Depending on how closely related the originating sources are for the two, I
would recommend either the second (if they are similar) or the third if they
are not. Any of the above will work.

Scott Kitterman

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Janine wrote:
>My question is, do I need to set up two SPF records,
>one for the main domain and another for the subdomain or can I just create
>one SPF record and include all IP addresses?

One thing to keep in mind for email -- all addresses
consist only of:
<local_part>@<domain>

Whatever follows the @ in an email address is, by
definition, a domain as far as a mail transfer agent
is concerned.

So, yes, you need to publish spf for both domains.

If you want to be kind, and it works out for you, try
and use a: information in spf, as that should minimize
the DNS operations performed by the destination's spf
checks.

Hope this helps,

Len

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