Can you pass SPF without adding your ESP?
No. You cannot pass SPF without including your sending sources. SPF checks whether the sending IP appears in authorized sources. If your ESP's IP is not included, SPF fails for mail they send.
Some senders incorrectly believe SPF checks only their own server. Every service sending on your behalf needs inclusion: ESPs, marketing tools, transactional services, CRM systems.
Review all legitimate sending sources and include them in your SPF record. Missing any authorized sender causes SPF failures for their mail.
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