Instantly

Cold-email sending with mailbox warm-up and rotation.

What it is for

Running outreach from secondary domains at small daily volumes with warm-up built in.

cold email · outreach · warm-up

Google email sender guidelines◆ — The rules Gmail applies to bulk senders — authentication, unsubscribe, spam rate. free
beehiiv — Newsletter platform built around growth — referrals, recommendations, ad network. free tier
Buttondown — A minimal, developer-friendly newsletter tool with Markdown and an API. free tier
Kit (formerly ConvertKit) — Creator email with automations, landing pages and commerce. free tier
MXToolbox — Checks SPF, DKIM, DMARC, MX and blacklists for a domain. free tier
NeverBounce — Email list verification to keep bounces under control. paid
Substack — Newsletter publishing with a built-in discovery network and paid tiers. free tier

Suggest a correction — a changed price, a moved page, a better tool for the task.