That may have been true a while back, but I am finding that these days my
DKIM-signed mail is being accepted by yahoo.  It must have been on their
TODO list to upgrade to DKIM right after the BIND9 upgrade (this is meant
to be a joke).  I think this is a recent development.

> I prefer dkim-milter. The one caveat I can think of is that
> dkim-milter supports only DKIM, not DomainKeys, and the last time I
> checked Yahoo is still stubbornly recognizing DomainKeys signatures
> only.
>
> -Heath
>
> On Tue, Jun 30, 2009 at 12:07 PM, Keith Lofstrom<[email protected]> wrote:
>> I need to add outbound DKIM signing to my email, so yahoo will
>> accept inbound email from my server.  I am using postfix 2.3.3
>> and Scientific Linux 5 (an RHEL5 clone).  I send mail from half
>> a dozen domains, and my DNS is split between my hosting provider
>> (rimuhosting) and dyndns.com .
>>
>> DKIM signing uses the private keys on my outbound mail server
>> to generate an SHA-256 cryptographic signature for the message
>> body and header.  This is added to the header in the outbound
>> mail.  The recipient verifies the mail using the public key in
>> the DNS record for the domain.  I will set up one key pair for
>> each domain.
>>
>> There are at least two tools out there for outbound verification:
>>
>> --- dkimproxy,  tutorial example at:
>> http://anothersysadmin.wordpress.com/2008/01/16/domainkeysdkim-with-postfix/
>>
>> --- dkim-milter, tutorial example at:
>> http://www.topdog.za.net/postfix_dkim_milter
>>
>> Does anybody have a preference between these two?  I am leaning
>> towards the dkim-milter option, because there is an RPM package,
>> the postfix configuration looks simpler, it is transportable to
>> other mailing packages, and it does not depend so much on the
>> integrity of underlying Perl modules.  But there may be hidden
>> suckage that I don't know about, or other DKIM packages that
>> come with free ice cream and ponies.
>>
>> Keith
>>
>> --
>> Keith Lofstrom          [email protected]         Voice (503)-520-1993
>> KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon"
>> Design Contracting in Bipolar and CMOS - Analog, Digital, and Scan ICs
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