email - SPF record for relay server? -

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i'm relatively new spf, have read quite bit , i'm still confused. have 2 mail relays mx servers domain. these servers receive mail domain forward on internal exchange server. exchange server server strictly sends mail domain not reject or bounce or otherwise undeliverable messages. relay servers still need spf records in case, or exchange server since 1 sending mail "from:" domain?

so spf records defined on domain, not server, think question 'do relay servers need directives in spf record domain?'. assuming relay servers never make outbound smtp connections receiver email servers, answer no. in case need include exchange server.

spf defining rule set list of ip addresses allowed connect receiving mail server , deliver email via smtp. evaluated perspective of receiving server, ip addresses connect directly receiving server need included in spf rule.


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