On alot of the networks we manage, we set up an smtp relay locally on the network for thinks like scan to email (alot of scanners and printers that were older didnt have authentication) and other notification/alert sending devices. The relay is IP restricted. We used IP SPF to allow the sending. We also did SPF to allow things like webservers to send on behalf of. If we implement dkim, will that require that the signature be attached to ALL domain emails, or will SPF still be functional for the relays and whatnot through dmarc rules?
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