Hello, my server is running on cPanel. We sign outing emails with DKIM and setup SPF records as well as reverse DNS.
But sending mail to Yahoo requires both DKIM and DomainKeys.

here is the header of my server's email sent to Yahoo Mail!:
domainkeys=neutral (no sig); from=mongolemail; dkim=pass (ok)

but here are the other email service provider's email header:
domainkeys=pass (ok); from=newegg.com; dkim=pass (ok)

as you can see my server is not passing DomainKeys, but other's are DO.

How do i setup both DomainKeys and DKIM together?

thank you

DKIM and domainkeys are part of the same setup.

A good write up of how this is setup is at:
http://www.gettingemaildelivered.com...il-effectively

The records used in DNS are actually TXT rather than SPF even though they may reference SPF.

For one domain I know that uses DKIM there are 3 TXT records to allow pardot.com to send email on its behalf:

@ IN TXT "v=spf1 mx include:aspmx.pardot.com ~all"
;
_domainkey IN TXT "t=y; o=~;"
;
smtpapi._domainkey IN TXT "k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDPtW5iwpXVPiH5FzJ7Nrl8USzuY9zqqzjE0D1r04xDN6qwziDnmgcFNNfMew VKN2D1O+2J9N14hRprzByFwfQW76yojh54Xu3uSbQ3JP0A7k8o8GutRF8zbFUA8n0ZH2y0cIEjMliXY4W4LwPA7m4q0ObmvSjhd6 3O9d8z1XkUBwIDAQAB;"

Note that everything after TXT on the smtpap._domainkey line above is ONE line.