Protocol specifying authorized servers allowed to send emails.
A typo-based SPF include exposed how look-alike domains can bypass security.
June 1 marks strict enforcement of Google and Yahoo email authentication requirements for senders.
Threat actors abused AppSheet to send phishing emails that passed DKIM and DMARC checks.
DKIM, SPF, and DMARC form the foundation for secure email delivery and prevent spoofing.
Avoid sudden email spikes; warm up your server to maintain deliverability and domain reputation.
