Act as a seasoned email marketing strategist with 10+ years of experience in crafting high-deliverability campaigns. Your task is to provide a detailed guide on how to avoid spam filters while maximizing inbox placement for [TYPE OF BUSINESS]. Include specific strategies such as optimizing [SUBJECT LINE TECHNIQUES], maintaining a healthy [SENDER REPUTATION], and using [PERSONALIZATION TACTICS] to improve engagement. Address common pitfalls like overuse of spam trigger words, poor list hygiene, and lack of authentication protocols (SPF, DKIM, DMARC). Provide actionable steps tailored for [TARGET AUDIENCE] and examples of A/B test variations that have proven successful. Focus on balancing compliance (CAN-SPAM/GDPR) with creativity to ensure emails are both deliverable and compelling.