Are DomainKeys for e-mail signing dead?

Matthew Black Matthew.Black at
Fri Feb 28 22:51:30 UTC 2014

Apologies if I slept through prior discussions on the topic.

E-mail from our L-Soft LISTSERV was recently rejected by Yahoo with the following error:


    Last error: 5.7.9 554 5.7.9 Message not accepted for policy reasons. See

I note:

1.       The e-mail error (5.7.9) references the link

2.       That Yahoo page does not mention error 5.7.9, but references a similar error 5.7.4 "Message not accepted for policy reasons."

3.       It appears that Yahoo wants inbound messages signed using DomainKeys technology.

4.       Yahoo is the lead inventor of DomainKeys, along with Cicso, PGP, and Sendmail.

5.       L-Soft LISTSERV manuals and Yahoo both refer to the website

6.       When I click on the Documentation and DomainKeys Implementors Mailing List links on that page, I get page not found.

7.       A 2007 USA Today Article ( mentions that DomainKeys have not been widely adopted.

8.       A basic Google search for DomainKeys comes up with no recent articles. One website ( says that DKIM/DomainKeys are dead.

Are the rumors of the death of DomainKeys premature? If not, is anyone from Yahoo listening?

matthew black

california state university, long beach

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