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SPF and DKIM setup for ProtonMail

To enhance email authentication and domain handling in ProtonMail, it is recommended to configure SPF and/or DKIM settings. By configuring SPF and/or DKIM, you can improve the authenticity and deliverability of your email campaigns. For a step-by-step guide on setting up SPF and/or DKIM in ProtonMail, please visit this link.