Practice
Double opt-in intro
A double opt-in intro is an introduction made only after both people have separately agreed to it — so nobody gets an unwanted obligation in their inbox.
The problem the practice solves is the blind intro: an email that connects two people without warning, leaving the more senior or busier party publicly cornered — ignore it and look rude, or engage and donate an hour they never offered. The double opt-in fixes the asymmetry by inserting one step: before connecting anyone, the introducer privately asks the receiving party whether they want the intro at all, usually by forwarding a short blurb the requester wrote. Only after a yes does the actual introduction email go out.
Venture capitalist Fred Wilson named and popularized the convention in a 2009 post on his blog AVC, and it spread from venture circles into general professional etiquette. The insight that made it stick is that an introduction is not a gift to both parties — it's a request made of one of them, and requests deserve the option of a quiet no.
In practice the whole protocol rides on one artifact: the forwardable email. The requester writes a few self-contained lines — who they are, why this specific person, what they're asking for — which the connector forwards with a one-line endorsement. If the answer is no, the requester simply never hears the details, and no feelings are bruised. The friction is two messages instead of one; the payoff is that every intro that does happen starts with a recipient who actively chose it.
Origin: Fred Wilson's 2009 AVC post
Wilson's position as a New York VC put him at the receiving end of a constant stream of intro requests, and his November 2009 post "The Double Opt-In Introduction" codified how he wanted them handled: check with the person being asked, get their consent, and only then connect. The post is short, but it landed because it gave a name and a script to a courtesy many busy people already wished existed. Within a few years the phrase had become standard vocabulary in startup ecosystems — founders learned to write forwardable emails, and "happy to intro, double opt-in as always" became a stock reply. The convention's spread is a nice case study in etiquette-as-protocol: one clearly written rule, adopted because it cheaply protects the scarcest resource in any network — the attention of its most-connected members.
The forwardable email, step by step
Write it as if the target will read it with zero context, in five to eight lines. Line one: who you are, anchored in something verifiable. Lines two and three: why this specific person — show you know their work, not just their title. Lines four and five: the concrete ask, scoped small (a 20-minute call about X beats "would love to pick your brain"). Close by making refusal easy: "and if now's a bad time, absolutely no hard feelings." Send that to your connector with a one-line note: "Would you be comfortable forwarding this to Maria? If not, no worries at all." The connector forwards, adds their endorsement, and waits. Two rules keep you welcome: never follow up more than once on a pending opt-in, and never ask who said no.
Keeping pending intros from falling through
The double opt-in's weakness is operational: with three parties and two consent steps, threads stall silently — the connector forgets to forward, the target's yes arrives while you're traveling, or you get the intro and let it age a week, which quietly insults both other parties. This is bookkeeping, and bookkeeping is what a personal CRM is for. In Endearist, a pending intro becomes a note on the contact and a reminder a few days out: who you asked, for an intro to whom, and on what date. When the intro lands, the journal entry about how the conversation went becomes the raw material for the loop-closing thank-you to your connector — the small act that determines whether there's ever a next intro.
Frequently asked questions
- Why do investors insist on double opt-in introductions?
- Because their inboxes are the bottleneck of their job. A blind intro forces a public choice between rudeness and an unplanned commitment; the double opt-in lets them decline privately, before anyone is watching. It also acts as a filter: a founder who can produce a crisp forwardable email and navigate the protocol has already demonstrated baseline competence and respect for other people's time.
- What should a forwardable email contain?
- Five to eight self-contained lines: who you are with one verifiable anchor, why this specific person rather than anyone with their job title, and one concrete, small ask — a short call, a specific question, feedback on one document. End with an explicit no-pressure exit. It must work standing alone, because the target reads it before they know anything else about you.
- Is a double opt-in always necessary?
- No. Between peers who'd obviously enjoy meeting, or when someone has standing permission — "send me anyone working on this" — a direct intro is fine and faster. The protocol earns its overhead whenever there's an asymmetry: one side is busier, more senior, or being asked for something. When in doubt, ask first; nobody has ever resented being given the chance to say yes.
Last updated: 2026-06-10
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