Deliverability Foundations
- - Authenticate all sending domains: SPF, DKIM, and DMARC — missing any one tanks deliverability
- Warm up new domains/IPs: start with 50-100 emails/day, increase 20% daily over 2-4 weeks
- Never buy email lists — purchased lists destroy sender reputation permanently
- Clean list regularly: remove bounces immediately, unengaged after 90 days
- Monitor blacklists: MXToolbox, Google Postmaster Tools — problems compound if not caught early
List Health Metrics
| Metric | Healthy | Warning | Critical |
|---|
| Open rate | >20% | 10-20% | <10% |
| Click rate |
>2% | 1-2% | <1% |
| Bounce rate | <2% | 2-5% | >5% |
| Unsubscribe | <0.5% | 0.5-1% | >1% |
| Spam complaints | <0.1% | 0.1-0.3% | >0.3% |
- - One spam complaint per 1000 emails is the danger zone — above this, inbox placement drops sharply
Subject Lines
- - 40-50 characters optimal — truncates on mobile after 35-40
- Personalization works: name or company in subject increases opens 10-20%
- Curiosity beats clarity for opens, but clarity wins for clicks — balance based on goal
- Avoid spam triggers: ALL CAPS, excessive punctuation!!!, "free", "act now"
- Test emoji: works for some audiences, hurts others — A/B test before committing
- Preview text is second subject line — don't waste it with "View in browser"
Email Sequences
Welcome sequence (5-7 emails over 2 weeks):
- 1. Immediate: Deliver promised value + set expectations
- Day 1: Best content or quick win
- Day 3: Story/origin + values
- Day 5: Social proof + case study
- Day 7: Soft offer or deeper engagement
- Day 10: Address common objection
- Day 14: Clear CTA
- - First email in sequence has highest open rate — make it count
- Space emails 1-3 days apart — daily is too aggressive for most audiences
Segmentation
- - Segment by behavior, not just demographics — what they clicked matters more than job title
- Minimum viable segments: new subscribers, engaged (opened in 30 days), unengaged, customers
- Tag on every click — builds behavioral profile automatically
- Sunset unengaged subscribers after 90 days — send re-engagement, then remove
- VIP segment for highest engagement — reward them with early access, exclusives
Timing and Frequency
- - Tuesday-Thursday mid-morning performs best on average — but test your audience
- B2B: business hours. B2C: evenings and weekends can work
- Frequency depends on value: daily works if valuable, weekly fails if boring
- Let subscribers choose frequency — reduces unsubscribes significantly
- Send time optimization: most ESPs offer this, use it
Campaign Types
- - Newsletter: regular value, builds relationship, low direct conversion
- Promotional: clear offer, urgency, direct conversion focus
- Transactional: receipts, confirmations — highest open rates, add value here
- Re-engagement: "We miss you" + incentive + easy unsubscribe
- Announcement: product launches, major updates — segment to interested only
Writing for Email
- - One goal per email — multiple CTAs dilute response
- Write for skimmers: bold key phrases, short paragraphs, bullet points
- P.S. lines get read — put secondary CTA or key point there
- Plain text often outperforms HTML for personal-style emails
- Mobile-first: 60%+ open on mobile — single column, large tap targets
Automation Triggers
- - Sign up → Welcome sequence
- Purchase → Onboarding + cross-sell sequence
- Abandoned cart → 3-email recovery (1h, 24h, 72h)
- No open in 30 days → Re-engagement sequence
- Link click → Tag and trigger relevant follow-up
- Date-based → Birthday, renewal reminder, anniversary
A/B Testing
- - Test one variable at a time: subject, send time, CTA, from name
- Need 1000+ recipients per variant for statistical significance
- Subject line tests: 20% of list first, winner to remaining 80%
- Measure what matters: opens for subject, clicks for content, conversions for offers
- Document every test — institutional learning prevents repeat experiments
Common Mistakes
- - Sending to entire list always — segment or face declining engagement
- No double opt-in — leads to fake emails and spam traps
- Ignoring mobile preview — broken layouts kill credibility
- Same email to all segments — personalization is expected now
- Hard selling too early — value first, offer later
- Ignoring unsubscribe feedback — they tell you what's wrong
Compliance
- - Include physical address in every email — required by CAN-SPAM, GDPR
- Unsubscribe must work within 10 days — one-click preferred
- Honor opt-outs immediately — delayed removal is illegal in many jurisdictions
- GDPR: explicit consent required, document it, allow data deletion
- Separate consent for different email types — marketing vs transactional
投递基础
- - 对所有发送域名进行身份验证：SPF、DKIM 和 DMARC——缺少任何一个都会严重影响投递率
- 预热新域名/IP：从每天50-100封邮件开始，在2-4周内每天增加20%
- 绝不购买邮件列表——购买的列表会永久破坏发件人声誉
- 定期清理列表：立即移除退信，90天后移除未互动用户
- 监控黑名单：使用MXToolbox、Google Postmaster Tools——问题若不及时发现会不断累积
列表健康指标
| 指标 | 健康 | 警告 | 危险 |
|---|
| 打开率 | >20% | 10-20% | <10% |
| 点击率 |
>2% | 1-2% | <1% |
| 退信率 | <2% | 2-5% | >5% |
| 退订率 | <0.5% | 0.5-1% | >1% |
| 垃圾投诉率 | <0.1% | 0.1-0.3% | >0.3% |
- - 每1000封邮件中出现一次垃圾投诉即进入危险区——超过此阈值，收件箱投递率将急剧下降
主题行
- - 最佳长度为40-50个字符——移动设备上35-40个字符后会被截断
- 个性化有效：主题中包含姓名或公司名可提升打开率10-20%
- 好奇心比清晰度更能提升打开率，但清晰度更有利于点击——根据目标平衡
- 避免垃圾邮件触发词：全部大写、过多标点符号!!!、免费、立即行动
- 测试表情符号：对某些受众有效，对另一些则适得其反——使用前进行A/B测试
- 预览文本是第二主题行——不要浪费在在浏览器中查看上
邮件序列
欢迎序列（2周内发送5-7封邮件）：
- 1. 立即发送：兑现承诺价值 + 设定预期
- 第1天：最佳内容或快速见效的技巧
- 第3天：故事/起源 + 价值观
- 第5天：社会证明 + 案例研究
- 第7天：软性邀约或深度互动
- 第10天：解决常见异议
- 第14天：明确的行动号召
- - 序列中的第一封邮件打开率最高——务必充分利用
- 邮件间隔1-3天——对于大多数受众，每天发送过于激进
细分策略
- - 按行为而非仅按人口统计细分——他们点击了什么比职位头衔更重要
- 最小可行细分：新订阅者、活跃用户（30天内打开过）、非活跃用户、客户
- 每次点击都打标签——自动建立行为画像
- 90天后淘汰非活跃订阅者——先发送重新激活邮件，然后移除
- VIP细分用于最高活跃度用户——以优先体验、专属权益奖励他们
时机与频率
- - 周二至周四上午中段平均表现最佳——但需测试你的受众
- B2B：工作时间。B2C：晚间和周末也可能有效
- 频率取决于价值：有价值则每日可行，无聊则每周也失败
- 让订阅者选择频率——可显著降低退订率
- 发送时间优化：大多数ESP提供此功能，请使用
活动类型
- - 新闻通讯：定期提供价值，建立关系，直接转化率低
- 促销活动：明确优惠，营造紧迫感，聚焦直接转化
- 交易邮件：收据、确认函——打开率最高，在此处增加价值
- 重新激活：我们想念你 + 激励 + 便捷退订
- 公告：产品发布、重大更新——仅细分给感兴趣的用户
邮件写作
- - 每封邮件一个目标——多个行动号召会稀释响应
- 为扫读者设计：加粗关键短语、短段落、要点列表
- P.S. 行会被阅读——在此放置次要行动号召或关键点
- 纯文本邮件在个人风格邮件中通常优于HTML
- 移动优先：60%以上在移动设备打开——单列布局、大点击区域
自动化触发
- - 注册 → 欢迎序列
- 购买 → 引导 + 交叉销售序列
- 购物车放弃 → 3封邮件挽回（1小时、24小时、72小时）
- 30天未打开 → 重新激活序列
- 点击链接 → 打标签并触发相关跟进
- 基于日期 → 生日、续费提醒、周年纪念
A/B测试
- - 一次只测试一个变量：主题行、发送时间、行动号召、发件人名称
- 每个变体需要1000+收件人才能达到统计显著性
- 主题行测试：先用20%的列表测试，胜出者发送给剩余80%
- 衡量关键指标：主题行看打开率，内容看点击率，优惠看转化率
- 记录每次测试——机构知识积累可避免重复实验
常见错误
- - 总是发送给整个列表——不细分则互动率持续下降
- 没有双重确认订阅——导致虚假邮件和垃圾邮件陷阱
- 忽略移动端预览——布局错乱会破坏可信度
- 对所有细分发送相同邮件——个性化已是基本要求
- 过早强硬推销——先提供价值，再提出邀约
- 忽略退订反馈——他们告诉你问题所在
合规要求
- - 每封邮件包含实体地址——CAN-SPAM和GDPR要求
- 退订必须在10天内生效——一键退订为佳
- 立即尊重退订选择——延迟移除在许多司法管辖区违法
- GDPR：需要明确同意，记录在案，允许数据删除
- 不同类型邮件需分别获得同意——营销邮件与交易邮件
