How to Verify a Vendor’s Customer Support EmailA customer support message can look perfectly familiar while coming from an unrelated mailbox. Attackers often copy a vendor’s branding, ticket numbers and…Why SPF can pass while DKIM failsAn email domain that passes SPF but fails DKIM may still belong to a genuine sender. These two authentication methods examine different parts of the delivery…How to vet an unexpected invoice domain safelyAn unexpected invoice attached to an email deserves careful scrutiny, even when the message appears to come from a familiar supplier. Payment redirection…What a 512-Bit DKIM Key Says About Sender SecurityA DKIM key length of 512 bits reveals that a sender is relying on an outdated level of cryptographic protection. DomainKeys Identified Mail (DKIM) adds a…Build a daily digest of brand-matching domainsA newly registered domain can imitate a familiar Australian brand before its owner sends a message. It may use a plausible business name, a misleading…Valid DMARC and No Alignment Still Leave Impersonation RiskDMARC is often mistaken for a guarantee that an email genuinely came from the named organisation. In reality, it is a shared rule for authenticating domain use…How to Detect Punycode Lookalike Domains Bypassing Visual InspectionLookalike domains have become one of the quietest threats in email security. Attackers register domains that visually mimic a trusted brand, then use them in…What SPF Hard Fail Reveals About Email InfrastructureAn SPF record with a permanent hard fail can reveal far more than whether a message passed a single authentication check. The -all mechanism tells receiving…Use an API to Flag Overnight SPF ChangesSPF tells recipients which hosts may send for a domain. Attackers can imitate senders while studying visible policies, and an unauthorised change can weaken…Why DMARC Alignment Alone Is Not Proof of LegitimacyEmail authentication helps establish whether a message was authorised by the domain in its From header. It does not establish that the sender is trustworthy,…