We have WorkOS and are sending out activation emails for our beta product. They activation email (with the link) ends up in spam. We've tried so many different combos (plain text vs. html, vs. no hyperlink), and it seems like anything with a link is getting bounced. I'm worried about our domain health and curious if there's a better way to diagnose the problem
痛点：初创团队的激活邮件/事务邮件被判定为垃圾邮件，创始人无法定位是域名信誉、SPF/DKIM/DMARC、链接还是内容触发的问题，缺少可操作的诊断手段。
目标用户：使用 WorkOS/Resend/SendGrid 等发信服务的早期 SaaS 与独立开发者，尤其是做冷启动激活邮件的团队。
证据：We have WorkOS and are sending out activation emails for our beta product. They activation email (with the link) ends up in spam. We've tried so many different combos (plain text vs. html, vs. no hyperlink), and it seems like anything with a link is getting bounced. I'm worried about our domain health and curious if there's a better way to diagnose the problem
变现：按域名订阅的邮件送达率诊断 SaaS（$19–49/月）：监控域名信誉、SPF/DKIM/DMARC/BIMI 配置、黑名单、种子邮箱投递测试，并按月出报告；可加一次性深度审计包。
MVP：两周内做一个轻量 MVP：用户输入域名 + 发信服务商，后端跑一组检查（DNS 记录校验、RBL 黑名单查询、DMARC 策略解析、向 Gmail/Outlook 种子邮箱发测试信并抓取垃圾箱结果），用一份红黄绿评分报告指出最可能的失败原因和修复步骤，先做邮件订阅式报告。
竞品：MXToolbox、GlockApps、MailReach、EasyDMARC、Postmark Message Stream / DMARC Digests、Warmy
摘要：一位 HN 用户用 WorkOS 为 beta 产品发激活邮件，发现只要邮件里带链接就进垃圾箱，已尝试纯文本/HTML/去掉超链接等多种组合仍失败，担心域名信誉受损且缺少诊断工具。帖仅 6 分 0 评论，属于真实但未验证的高频痛点；邮件送达率诊断赛道已有 MXToolbox、GlockApps 等成熟玩家，竞争空间有限，但面向独立开发者与小团队的轻量自动化诊断仍有单人或小团队切入机会。