CosmoBlk

Comprehensive, data-backed email marketing knowledge base. 908 sources, 4,798 insights. Use when reviewing email setups, building automation flows, diagnosing deliverability, writing email copy, selecting platforms, or pulling benchmarks. Covers strategy, flows, deliverability, copywriting, segmentation, compliance, cold email, and 19 industry playbooks.

Design distinctive, on-brand emails — newsletters, campaigns, welcome series, promo, post-purchase, win-back, transactional, announcements. Use when the user wants to draft, write, compose, design, redesign, critique, polish, or improve an email; or send a campaign / blast / broadcast through any ESP (Nitrosend, Klaviyo, Mailchimp, ActiveCampaign, etc.). Produces a structured design brief and translates it into the sending tool's section format. Bakes in anti-slop principles: own a colour, restrained palettes, real imagery with sourced or prompted image slots, distinctive voice, no category-reflex aesthetics, no orphan whitespace, single column ≤600px, mobile-first, real footers (verified mission only, plus socials + address + unsubscribe). Asks at most three questions to fill brand gaps; otherwise infers from connected ESP account settings or a project brand file. Self-contained — no other skills required. Skip for pure strategy, deliverability, copy-only, or platform-selection questions.