You can't sign messages from a non local domain, by definition 
domainkeys needs a domain you host in order to be able to
sign it (since you must have the secret key of the domain in question)  
But I'm not sure what from/sender headers you are using....

But, ignoring that, I can't actually spot the authentication requirement 
in the code, thats probably something we can fix if is a problem.  I 
suggest you try it and if it fails send me your surgemail.ini and 
mail.log and I'll tell you why its not signing the message.

    ChrisP

surgemail-list@netwinsite.com wrote:
> A post on Jan 26 2007 by ChrisP in response to "can't get outgoing DomainKeys working" indicated:
>   It only signs a message if the source is local, and authenticated, and the destination is not local. 
>
> Has this changed since then? Is there a way to use DomainKeys signatures if outgoing email is the
> outgoing sender is not being authenticated?
>
> We are using SurgeMail to send outgoing opt-in email for customers. We do not authenticate, and just
> relay by putting our mail generator's IP address in the rule "Allow relaying from users at these ip
> addresses".
>
> Thanks in advance - Richard
>   

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