Cold email
Two different products get confused here constantly, and treating them as one is the most common reason a campaign dies quietly. The sequencer sends and follows up. The infrastructure carries the message and decides whether it arrives at all. You need both, they come from different suppliers on purpose, and the second one has to be bought weeks before the first one runs. Infrastructure is priced per mailbox per month, and that is the only number to size an estate on: 2.60 dollars on a provider's own infrastructure, 3.40 on Google Workspace, 4.30 on Microsoft 365. A dedicated IP is 170 dollars a month, which is a real decision rather than a default, because on low volume a shared pool is warmer than anything you can build alone. Never send cold from the domain that also carries your invoices and your password resets: reputation damage is not something you undo by stopping. Warm up before ramping, which means the honest answer to when can we start is about three weeks. On the sending side, ignore the headline price and line up four numbers instead: emails a month, active leads, mailboxes and bundled enrichment credits. Active leads is the one that runs out first, because a lead stays active for the whole length of a cadence. And check what the tool does the day a mailbox starts failing, because that is the day the plan is actually tested.
Line up four numbers, and let active leads decide
The sequence builder is the part everybody compares and the part that decides nothing. Put two plans side by side and read four numbers instead: emails a month, active leads, mailboxes, and bundled enrichment credits. Active leads is the one that runs out first, because a lead stays active for the entire length of a cadence, so a five-step sequence holds its contacts hostage for weeks.
PlusVibe bills on email volume and active leads rather than per mailbox: 25,000 emails and 30,000 active leads on the entry plan, 150,000 and 100,000 on the business plan, read 18 September 2026. That unit matters more than the price, because per-mailbox billing taxes the exact behaviour that keeps you out of spam, which is spreading the sending thinly across many senders.
Two other things to settle before buying. Whether one client can contaminate another, which is what an agency tier is really selling with isolated sending and dedicated IPs. And what the tool does on the day a mailbox starts failing, because that is the day the plan is actually tested, not the day you sign.
A reply is where the money is, and where it gets lost. A positive answer sitting unread for three days is a dead deal that reports as a successful campaign. The checks we run before a send are in cold email sending: what to check, and the catalogue is on Cold email and sales engagement.
All Cold email toolsBuy the estate three weeks before you plan to launch
Infrastructure carries the message. The sequencer sends it. Treating those as one product is the most common reason a campaign dies quietly, and it is a buying mistake rather than a copy mistake.
The unit here is the mailbox, per month, and it is the only number that sizes an estate. Mailpool publishes 2.60 dollars on their own infrastructure, 3.40 on Google Workspace and 4.30 on Microsoft 365, read 18 September 2026, with annual billing taking off fifteen percent. A dedicated IP is 170 dollars a month, which makes it a decision rather than a default: on low volume a shared pool is warmer than anything you can build on your own.
Never send cold from the domain that also carries your invoices and your password resets. Reputation damage is not something you undo by stopping.
Get SPF, DKIM and DMARC written correctly at the moment each domain is created, which is most of what you are paying a provider to automate. Then warm up before ramping, which is why the honest answer to when can we start is about three weeks. Nobody wants that answer and it does not get shorter by being ignored.
The order we do it in is in six steps to stay out of spam. What the layer costs, provider by provider, is on Email infrastructure and deliverability.
All Deliverability toolsTwo suppliers, bought weeks apart, and the second one first. That is the whole sequencing lesson of this part of the stack. Every price above is the vendor published figure with its reading date, and the mailbox counts are ours.
The categories in here
What I wrote about them
2 pieces
- Choosing a cold email platform: the four questions that decide it, and the three that do not
Every sequencer demo shows you the sequence builder. The sequence builder is not where campaigns fail.
- Staying out of spam: the infrastructure decisions that are made before the first email
Deliverability is decided by choices made weeks before a campaign launches. None of them are about the copy.