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Configure DKIM & SPF on external mail server or where DNS records are stored?

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linux-howto

http://serverfault.com – I have a Linux server on example.com and an external mail server on mail.example.com. These two records are stored on Linux server: mail.example.com. IN A 1.2.3.4 example.com. IN MX 5 mail.example.com. and till now there is no records configured on mail server. So where should I configure DKIM-Filter and SPF? On mail server or on linux server? (HowTos)