How does email security overlap with deliverability?

Security and deliverability share common foundations. Authentication (SPF, DKIM, DMARC) serves both: it prevents spoofing (security) and improves inbox placement (deliverability). Proper authentication is essential for both goals.

Reputation connects both domains. Security incidents (compromised accounts, spam outbreaks) damage reputation, harming deliverability. Good deliverability practices (clean lists, engaged recipients) reduce security concerns by minimizing abuse signals.

Filters serving security also affect deliverability. Systems blocking phishing and malware evaluate all email, including legitimate marketing. Understanding how security filters work helps avoid triggering them with legitimate messages.