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The minimum viable outbound stack

The floor is four jobs, not four tools: a place to send from, a way to reach the right person, something that sends the follow-ups, and somewhere the answers land. Almost every one of those jobs has a real free option today. One has none, from anybody, and it is the one founders buy last.

By Rahul Bageria, co-founder · Updated August 2026 · 9 min read

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The floor

Four jobs, not four tools

Write down the jobs first. Then work out which you already cover, which your hands still do faster, and which one you have to buy.

Our guide to the outbound tech stack counts six jobs, because it includes the judgment work you do yourself at the start (who to write to, one true thing about each of them, and when something changes), while everything below is the part that needs a tool running.

The job	What it has to do	What usually covers it	Free version?
A place to send from	A domain you own, kept away from your main one.	A mailbox provider, or a bulk reseller.	No. Not from anyone.
A way to reach the right person	Names and addresses, checked before you send to them.	A contact database, your own reading, or your sender.	Yes, with a monthly cap.
Something that sends the follow-ups	Sends the sequence and stops the moment somebody replies.	A sending platform, which now warms up new mailboxes too.	Yes, on one plan. Trials elsewhere.
Somewhere the answers land	Holds who you wrote to, who said no, what next.	A free CRM, plus whatever takes the booking.	Yes, with no expiry date.

Every answer in the last column comes from the vendor's own current pricing page, read in August 2026: Hunter, Google Workspace, HubSpot and Cal.com.

Prices move every few months. Which jobs have a free version moves far more slowly, so this post carries no prices.

The framework

Three reasons a layer is "not yet", and only one is real

Everything anybody tells you to buy sits in one of four bins. Founders lose money by using the wrong one.

Definition

A layer is one job in your outbound, not one tool. One tool often covers two. Two tools sometimes fight over one.

Bin one

Covered already

The job is real and something you already pay for does it. Skipping is fine until you meet the default nobody chose.

Bin two

Too small to bind

The job is real, and at sixty contacts your hands beat any setup. Fine until a named thing runs out.

Bin three

Not a layer at all

Scoring models, dashboards, a second sending tool. Nothing in this bin has ever produced a reply. Skip it indefinitely.

Bin four

Never free, and nothing substitutes

One item lives here: a domain you own and a mailbox on it. First money out, and the only money you cannot avoid.

A free tier is not a floor. It is a ceiling somebody else picked for you.

Bin four

The one layer nobody gives away

Go down the list of what outbound needs and you find a free version of nearly all of it. Then you reach the mailbox.

Every plan on Google's own Workspace pricing page is paid, and the only free thing there is a 14-day trial, checked August 2026.

The point

Resellers charge per mailbox too, and a domain has a lead time you cannot pay to shorten. So the market sells you the wrong order: the sender has the best trial, the database gives a free monthly allowance, and the part you wait for comes last.

How many domains and mailboxes you actually need is worked out in our cold email infrastructure guide.

One build, walked through

What the free floor actually covers

An illustrative walkthrough of the method, not a specific client result. We report real numbers only when they are real.

1

Step 1 · The purchase

Buy the place you send from

A secondary domain and mailboxes on it. This is the bill. Every step after it sits on somebody's published free plan.
2

Step 2 · Euros, August 2026

Find the addresses, check them

Seen from Europe, Hunter's own pricing page puts its free plan at 0 euros, with 50 credits a month for finding and checking addresses.
3

Step 3 · Where it caps

Send the follow-ups

The same free plan runs sequences, capped at one connected email account and 500 recipients each. The dedicated senders offer trials, not free plans.
4

Step 4 · No expiry

Keep the record, take the booking

HubSpot's own page calls its CRM "100% free with no expiration date". Cal.com marks its individual plan "Free forever". Both read August 2026.

Take out the domain and the mailboxes and the rest is zero, in whatever currency your card is billed in. Everything above that line is a purchase you make later, when something runs out.

Want the whole thing built and run by the two of us instead?

Book a Fit Check

Cancel something

Where one tool doing two jobs saves you money

Two purchases the market still sells separately, and both have moved inside something you may already pay for.

Warm-up tooling

Warm-up is the slow ramp that gets a new mailbox sending normally. It used to be its own subscription.

•Instantly lists unlimited warm-up inside the sending plan, August 2026
•lemlist says the same, included in all its plans
•Paying separately is a line you can cancel
•The warm-up tools roundup says which ones include it

Contact data

Senders are moving into the contact business too, which changes what you still have to buy.

•Smartlead lists verified prospect emails on every tier, August 2026
•Not necessarily the right database for your market
•Read the plan you already pay for first
•One invoice fewer beats one more dashboard

The catch

Where the second job quietly costs you

Double duty is fine when it saves a purchase. It is expensive when it hides a decision made on your behalf.

Vendor pages, August 2026

The bounce setting

Two senders, opposite defaults

Send to enough dead addresses and Instantly stops the campaign itself, once bounces pass 5%, on by default for everyone. Smartlead does it only if you enabled it and set the number. Both help centers, read August 2026.

That same threshold turns up in our guide to staying in the inbox, reached from a different direction. Corroboration, not coincidence.

The bundle

"All in one" is one login, not one bill

On Instantly's own pricing page the sending plan and the contact data are two line items with two prices. The trap is budgeting from the headline number.

The single mailbox

One inbox is one point of failure

Smartlead's own troubleshooting page names one connected mailbox with connection trouble as a reason campaigns stop. A one-mailbox plan has nowhere to fall back to.

Operator note

Do this today

Open your sending tool's settings before you open another tab. Find the bounce setting, write down the number and whether it is on, and keep it beside your domain records. Four minutes, and it is the one thing here you can finish today.

RB

Rahul Bageria

Co-founder, Real Good GTM

Consequences

What actually breaks when you skip each layer

Nobody has published what fails first in a thin stack, so this comes from mechanism. Each one names a consequence you will recognize.

Skip the address check

Your own tool stops you. Messages come straight back from addresses that never existed, and past the threshold the campaign pauses itself.

Skip the record

Campaign one is fine; your sender remembers it. In campaign two you write to people who already said no, and the prospect notices first.

Skip the sending tool

Nothing breaks until the second mailbox. One inbox and one sequence by hand is genuinely fine. Two by hand is somebody's whole morning.

Skip the contact database

Nothing breaks; it costs hours, and hours are the line nobody invoices. Buy one the week finding people takes longer than writing to them.

!

Caution

The list of people who said no cannot live in one tool

Change sending tools, start a fresh sheet, or run campaign two from another account, and every "please stop" from campaign one goes with it. Writing to that person again is the one mistake here you cannot take back.

Do this instead

Keep one list of everyone who asked you to stop, outside whichever tool sent the campaign.

Our rule

Buy the next thing when something runs out

Not when the month turns over, and not when a trial ends. Each gate below is an event you notice on the day.

Four gates

1

Second mailbox

Buy the tool that sends the follow-ups

One inbox is a morning routine. Two is a rota you forget on a Thursday. The gate is the second place mail goes out from.

2

Second campaign

Open the record, and it is free

Your first campaign lives in the sender's memory. Your second needs a place outside it, holding who you contacted and who said stop.

3

The hours flip

Buy the contact database

The gate is the first week where finding people costs more of your time than writing to them. Before that, an afternoon wins.

4

Bounces climbing

Buy the address checker

Watch the number your sender pauses on and buy before you reach it. ZeroBounce gives 100 free verifications a month on a business domain, so this gate arrives late.

Key takeaways

4 points

1 A stack is a list of jobs, mostly covered already.
2 The place you send from is never free.
3 Go and read your sender's bounce setting today.
4 Buy the next thing when something runs out.

FAQ

Questions founders ask

What is the minimum I need to start cold outbound?

Four jobs: somewhere to send from, a way to reach the right person, something that sends the follow-ups, and somewhere the answers land. Only the first one costs money on day one. A domain you own and a mailbox on it have no free version from anybody, and every other job on that list has a real free plan behind it.

Can I run cold email for free?

Almost all of it. Finding addresses, checking them, sending the sequence, keeping the record and taking the booking all have genuine free plans rather than trials. The domain and the mailbox do not, from any provider. That is the whole shape of the answer, and it is why your first purchase is also the only unavoidable one.

What happens if I skip checking email addresses?

Your own sending tool is likely to stop you. Instantly pauses a campaign by itself once the bounce rate passes 5%, and its help center says that is switched on by default for everyone. Smartlead describes the same feature but only acts if somebody enabled it and picked a threshold. Both read August 2026.

Is Google Workspace free?

No. Every plan on Google's own Workspace pricing page is paid, and the only free thing on the page is a 14-day trial, checked August 2026. Resellers sell mailboxes more cheaply per unit, but nobody gives them away. That is why the mailbox is the one line in an outbound stack you cannot get to zero.

Do I still need a separate warm-up tool?

Usually not. Warm-up, the slow ramp that gets a new mailbox sending normally, now sits inside the sending plan on the major platforms: Instantly's own pricing page lists unlimited warm-up in the plan itself, as of August 2026. If you pay a separate subscription for it, that is one of the few outbound purchases you can genuinely cancel.

How much should an outbound stack cost a month?

There is no honest published answer. Every total that ranks for this question was written by somebody selling a layer, and they disagree with each other by a factor of twenty. What does exist is one real build with the vendors' own list prices attached, and that is in our seed-stage outbound playbook.

About the author

Rahul Bageria

Co-founder of Real Good GTM. He has been the first business hire and Chief of Staff at seed-stage B2B startups, building outbound pipeline before any playbook existed. He wrote this one because founders keep asking him which tool to buy first, and the honest answer is a domain, which nobody sells as a tool.

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