SPF, DKIM, and DMARC are crucial email authentication methods that enhance deliverability, protect sender reputation, and prevent spoofing and phishing. SPF specifies authorized mail servers, DKIM adds a digital signature, and DMARC instructs recipient servers on handling authentication failures and offers reporting. Implementing these protocols, especially DMARC, should be carefully considered due to potential setup costs and the risk of blocking legitimate emails. Correct configuration, alignment of visible 'from' addresses, and monitoring DMARC reports are also important.