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I recently noticed in an e-mail i received in my gmail account showed the line "Signed-by: domainname.com" along with the simplified header information.  I became curious to find out more and learned a bit about DomainKey-Signatures and e-mail authentication.  So now I want to implement this in my own mail sending php applications.

 

I have an app that uses the phpmailer class to send multi-part e-mails.  I want to modify the headers so that email clients can validate the legitimacy of the mail they receive from my site.

 

So, where do I start?  I have an SSL certificate for my site, do I need to use that at all?

 

Thanks for any help pointing me in the right direction

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