From connecting a mailbox to your first reply: what actually happens
A concrete, day-by-day walkthrough of a first Norbelys campaign — connecting a mailbox, warmup, building the sequence, the launch, and the first real reply.
By David Lara, Founder
Founder-reviewed ·How we research and correct articles
Most explanations of a cold-email platform describe features in a list — warmup, sequences, analytics, unibox — as if they’re separate buttons you press in whatever order you feel like. That’s not how a first campaign actually goes. It goes in an order, with real waiting built into it, and knowing the order in advance is the difference between a first week that feels productive and one that feels like nothing is happening. Here’s what actually happens, step by step, from the moment you connect a mailbox to the moment a real prospect writes back.
The order matters more than any single step
Before the walkthrough, one thing worth saying plainly: the single biggest mistake a first-time sender makes isn’t a bad subject line — it’s doing these steps in the wrong order. Specifically, importing a list and hitting launch on day one, before a mailbox has any sending history. Everything below is written in the order that actually protects a new domain, not the order that feels fastest.
A first campaign, in the order it actually happens
Day 1 — connect a mailbox
Add the mailbox you're sending from, either an OAuth connection (Google Workspace, Microsoft 365) or SMTP credentials for anything else. Norbelys then hands you the SPF, DKIM and DMARC records to add at your DNS provider — three TXT records, usually a five-minute job once you're logged into the registrar.
Day 1-2 — DNS propagates, warmup starts automatically
Once the records verify, warmup begins on its own — you don't press a separate 'start warmup' button. The mailbox starts exchanging real, low-volume email with other mailboxes on the warmup network, building the sending history a brand-new address doesn't have yet.
Day 2-10 — build the sequence while warmup runs in the background
This is the part first-timers usually don't expect: warmup and campaign-building happen at the same time, not one after the other. Write the sequence steps, set delays between them, import and verify your contact list, and set up any A/B variants — all of it fits inside the same window warmup needs anyway, so nothing is actually idle.
Day ~10-14 — the mailbox reaches a healthy warmup status
The dashboard shows a status per mailbox — ramping, healthy, or paused — rather than a fixed countdown. Most reach healthy within one to two weeks, but the actual signal to check is the status itself, since two mailboxes that both "warmed for ten days" can be in different real states.
Launch day — the campaign starts sending, paced not blasted
Hit launch and the sequence starts working through your imported audience at a controlled daily pace per mailbox, not all at once. The dashboard shows sent, delivered, and — within a day or two — the first opens.
First reply — it lands in the unibox, matched automatically
When someone replies, it shows up threaded to the exact message it answered, and that person's sequence stops automatically so they never get the next scheduled step after they've already responded. No one has to notice and manually remove them.
Connecting the mailbox is the fast part
The first fifteen minutes are almost anticlimactic. Adding a mailbox is a few clicks for Google Workspace or Microsoft 365 through OAuth, or pasting SMTP credentials for anything else. What takes longer isn’t the platform — it’s DNS propagation and, if you’re setting up a fresh sending domain rather than an existing one, deciding on a secondary domain built specifically for outreach instead of sending cold email from the same domain your invoices and support replies run on. SPF and DKIM are the two records that matter most before anything else; the full DMARC rollout, including when it’s safe to move past a monitor-only policy, is covered separately once mail is actually flowing.
The waiting period is doing real work, not nothing
This is the stretch of the first campaign that trips people up most, because it’s the one part that doesn’t feel like doing anything. Warmup exists specifically to solve a problem a spreadsheet-and-SMTP setup can’t touch: a mailbox providers have never seen before gets no benefit of the doubt, and sending real volume into that silence is the single fastest way to end up filtered before the first sequence step even finishes. The full week-one ramp covers what a healthy climb actually looks like day by day if you want the mechanics; the short version for a first campaign is that this window isn’t dead time, it’s the part of the process that decides whether the campaign you’re about to launch has a real shot at landing in an inbox.
Building the sequence: what you’re actually deciding
While warmup runs, the actual campaign work happens: how many steps in the sequence, how many days between each one, whether a step needs an A/B variant, and which segment or imported list it sends to. None of this requires warmup to finish first — the sequence, the audience, and the mailbox’s readiness are three independent tracks that only converge at launch. Importing your list here also means letting verification run before you commit to anything: addresses get checked and deduplicated automatically, and a smaller final count than your original CSV is a sign the cleanup worked, not a bug.
Launch day, and what “paced” actually means for you
Hitting launch doesn’t send four hundred emails in the next ten minutes. Each mailbox works through its portion of the audience at a daily pace sized to what that mailbox’s reputation can currently support — a healthy, long-warmed mailbox handles more per day than one that just cleared warmup last week. You don’t set that ceiling by hand or guess at it; the dashboard just shows what’s actually going out and to whom, in real time, as the day runs. The first meaningful signal usually isn’t a reply — it’s opens, starting to show up within the first day or so, filtered to real humans rather than every automated prefetch and security scanner that touches the message before a person does.
The first reply, concretely
Here’s the part every founder is actually waiting for. Someone reads the first email, decides it’s worth a response, and hits reply. That message lands in the unibox — every reply across every connected mailbox, threaded to the specific message it’s answering, in one place instead of scattered across however many inboxes you’re running sends from. The moment that reply is detected, that person’s sequence stops on its own; they don’t get step three of a four-step sequence two days later because nobody remembered to pull them out manually. That’s the mechanical payoff of everything that happened in the two weeks before it — a reply that gets treated like a reply, not a row a spreadsheet forgot to update.
Questions people have before their first campaign
Can I skip warmup and just launch faster?
You can technically send before warmup finishes, but a mailbox with no sending history has no reputation for providers to trust, and volume without history is the fastest way to get filtered to spam before your sequence's first step is even done. The two weeks warmup usually takes is the cheapest insurance the campaign gets.
How long until I should expect a real reply after launch?
It varies by list quality, offer, and sequence length, but opens typically show up within the first day or two of a step going out, with replies trickling in over the following days as each step lands. A verified, well-targeted list replies faster and more often than a cold, unverified one — the two weeks spent on warmup and list verification directly affect this number.
Do I have to babysit the dashboard during warmup?
No — warmup runs on its own, and the useful thing to do during that window is build the sequence and clean the list rather than watch a status bar. Check in periodically to confirm the mailbox is still trending toward healthy, not stalled or flagged.
What happens to a step already scheduled if the recipient replies first?
It's cancelled automatically. Reply detection stops that person's sequence the moment the reply is matched, so there's no window where someone who already responded still gets the next scheduled message.
Start yours this week
Every piece of this walkthrough — the mailbox connection, warmup, the sequence builder, verified imports, the unibox — ships on every Norbelys plan starting at Starter, not gated behind a higher tier once you’ve proven you need it. If you’re weighing which plan actually fits the volume you’re about to run, the pricing breakdown lays out exactly what’s included at each level. Connect your first mailbox today and the two weeks between now and your first reply start counting immediately — the version of this walkthrough that costs you the most is the one where you don’t start it this week.