spf record setup

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http://serverfault.com – Emails sent by mta from my server recognizes by spam filters as spam and there's message : Received-SPF: neutral ... Actually, I am not spammer :) So, I googled around these questions and found that I need setup two things SPF record DKIM Now I am trying to correctly setup and tune on server SPF record. So, I did already: a. added spf record to domain hosted zone on amazon. It's something like this : "v=spf1 a mx ptr ip4:ip_adress_where_from_i_send_mail -all" b. checked spf record through spf query lib and also through spf checker http://www.kitterman.com/spf/validate.html spfquer (HowTos)