Newsletters still outperform social
Research and recent briefings show readers increasingly prefer independent newsletters and blogs for a trusted relationship with writers—best practices now call for weekly/biweekly cadence, serialized fiction, and AI tools to boost deliverability and list hygiene. Integrations (MailerLite/HubSpot) and exclusive content are the conversion levers publishers and indies are using. (blogherald.com) (blog.hubspot.com)
MailerLite’s 2025 analysis covered 1.4 million campaigns sent to more than 340 million subscribers and 12 billion total emails, and it grouped sender cadence into five bands: daily, twice-weekly, weekly, 1–3 times per month, and fewer than once per month. (mailerlite.com) (mailerlite.com) HubSpot’s April 2, 2026 deliverability guide notes Gmail and Yahoo tightened bulk-sender rules in 2024, defining bulk senders as domains sending roughly 5,000+ messages per day and listing requirements such as SPF/DKIM alignment, a published DMARC policy, and spam complaint rates below 0.3%. (blog.hubspot.com) (blog.hubspot.com) Substack’s fiction rankings show top-performing newsletters running regular serialized schedules—examples on the fiction top-25 include titles publishing twice-monthly and twice-weekly and drawing “tens of thousands” of subscribers on several listings. (substack.com) (substack.com) Practical author case notes from BookLife document writers serializing novels on Substack and report that building a reliable subscriber base can take many months—one author described reaching “critical mass” after about 10 months before beginning serialization. (booklife.com) (booklife.com) Email list-hygiene research from Usebouncer’s 2024 report found 36% of respondents flagged bounce rates and spam complaints as major challenges and 39.5% said they remove inactive subscribers only occasionally, underscoring the need for routine pruning. (usebouncer.com) (usebouncer.com) Deliverability tooling reviews list verification and testing vendors (ZeroBounce, NeverBounce, Mailtrap, SendGrid, Folderly and others) as standard parts of publisher stacks for pre-send checks, blacklist monitoring, and inbox-placement testing. (clearout.io) (clearout.io) Both MailerLite and HubSpot now advertise native syncs that enable two-way subscriber and engagement data flows—MailerLite’s HubSpot app and HubSpot’s Data Sync list two-way, real-time syncing to push subscriber status into CRMs and automation workflows. (mailerlite.com) (mailerlite.com) HubSpot’s AI guidance highlights that machine-learning systems can detect reputation shifts earlier and stabilize engagement patterns by flagging risky segments and suggesting list-cleaning actions before complaint rates force inbox filtering. (blog.hubspot.com) (blog.hubspot.com)
