Question : Email server with dkim, domainkeys, spf and senderid

Hi, i need an email server free, opensource, or eval (only need one account) with dkim, domainkeys, and spf. The objetive is relay the emails of my application, but as are transational email, i need emails arrive to inbox folder and not to spam folder, for it i should has all antispam techniques

Answer : Email server with dkim, domainkeys, spf and senderid

I find it: postfix