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I need sent 1 Milion email/day from many user. I use Interspire to manger & send email.
I was setup 1 VPS for App and 5 VPS for SMTP, and DKIM "pass", SPF not pass for all domain like amazonses and gmail, yahoo, hotmail in spam. Now I need SPF pass for all domain and gmail inbox >50%, hotmail inbox >70% and yahoo inbox >90%.
My system use CentOS 6, Postfix, OpenDKIM, balance