Hello Inbox

All usable data comes from a single HackerNews thread (152 comments, top 25 by upvotes shown). Context: the creator states HelloInbox is a free side-project checklist and toolkit built after he 'deep dived into email deliverability', fixed his own setup, and 'tripled my open rates to 65-80%'. Reception is genuinely mixed. Positives: commenters call it 'a nice checklist' and 'good advice' for reducing the complexity of SPF/DKIM/deliverability work; the creator clarifies it does NOT advocate purchasing lists and recommends validating single-opt-in contacts (fake addresses entered for ebooks); it emphasizes easy unsubscribe and pruning never-opening subscribers, which experienced senders in the thread endorse ('better just make it easy for people who are no longer interested to unsubscribe'). Technical disputes: the site recommends a dedicated IP at 50,000 emails/month, but one practitioner says experts put the threshold at 500,000+/month because Gmail/Outlook treat low-volume dedicated IPs as suspicious and domain reputation matters more; yet another reports the opposite — buying dedicated IPs for clients sending only ~50 transactional emails/week because shared ESP IPs kept getting RBL'd (SendGrid/SparkPost support said dedicated was the only fix). On IP vs domain reputation, users split: one says IP was 'the only significant factor' (Outlook silently rejected his mail until an SNDS support-ticket fix); another says neighbor spam in his /24 got his cheap-VPS IP blacklisted. Gaps flagged: missing reverse DNS (PTR) guidance — one user had to switch DNS providers, noting without rDNS 'you land in the spam folder for Outlook users' — and MTA-STS records. A concrete bug: 'The page is broken in several places in Firefox Mobile.' Ethical/legal pushback is the loudest negative signal: highly-upvoted comments argue unsolicited commercial email is illegal across AU, NZ, EU, UK, CA (opt-in regimes; UK ICO/PECR guidance cited), with US CAN-SPAM as the permissive outlier; GDPR compliance is called out as absent; one user says ~half the unsolicited mail he receives violates CAN-SPAM and he now auto-reports anything unfamiliar as spam (also citing fear of unsubscribe links as attack vectors). The creator pushes back that most customers use opt-in leads and transactional email legitimately. A chilling data point shared: a client's mislabeled 'warm' leads caused open rates to crash from 38-40% to under 7% 'within a few hours' after sustained spam complaints. Net: the artifact is seen as a useful, free simplification, but with disputed thresholds, technical omissions, one mobile rendering bug, and no compliance coverage.

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