Cold Email for B2B: Building Your First 500 Contacts

2026-05-18 · 7 min read

Cold email works when the list is relevant and small enough to personalize. Five hundred well-chosen contacts beat five thousand random addresses.

Build a hypothesis list

List 10 ideal customers by name. Study where they hang out online. For many B2B niches—coaches, agencies, local brands, creators—Instagram is the public resume with bio emails and links.

Source in layers

Layer 1: followers of a known leader in your niche. Layer 2: following lists of competitors’ clients. Layer 3: hashtag participants. Each layer should share traits with your hypothesis list.

Enrich before you write

Add follower counts, bios, and websites so you can segment (“under 10k” vs “50k+”) and tailor the first line of your email.

Fill the first 500 with MegaLeads AI

MegaLeads AI runs in Chrome on Instagram: extract from follower/following lists, enrich with AI for better email accuracy, and export to Excel. Starting from zero, many users build their first workable B2B list in an afternoon—not weeks of manual research.