Short answer: choosing a B2B acquisition agency well does not depend on its reputation or its website, but on asking ten concrete questions before you sign. The ones that best separate a serious agency from one that improvises are: who controls the deliverability of your emails, what data it contacts with, how you will see results, what lock-in it requires and how it reasons about price. An agency that answers these ten questions with clarity and data earns your trust; one that dodges them does not. This guide explains each question, what answer to look for and what answer is a red flag.
This guide is written by Nicolás Stocchero, Managing Director of Desorbitante. We designed it so you can use it with any agency you are evaluating, ourselves included: if you ask us these ten questions, we will have to answer with the same clarity we ask you to demand from everyone.
If you first want to understand what a B2B marketing agency actually does, what it costs and when it is (or is not) worth hiring one, we cover that in B2B Marketing Agency: What It Does, What It Costs and When to Hire One.
Why the questions matter and not the reputation
They matter because the sales pitch of almost every B2B acquisition agency is identical: “qualified leads”, “predictable pipeline”, “measurable results”. If you choose by reading websites, you will not be able to tell one from another, because they all say the same thing. The real difference between an agency that fills your calendar and one that burns your budget is in things that do not appear in the pitch: technical control of deliverability, data quality, reporting transparency and honesty about what they can and cannot do.
The ten questions in this guide are designed to surface those differences. They are not filler: each one reveals how the agency really works. A competent agency welcomes them, because they are a chance to show its judgment; one that improvises avoids them.
The 10 questions to ask before signing
1. Do I need just leads or the full acquisition engine?
This is the first decision, and it is yours, not the agency’s. If you already have a sales team that closes well and you only lack opportunity volume, a lead generation agency may be enough. If you also want to outsource paid advertising, the CRM and the whole operation, you need an agency that runs the full acquisition system. Confusing the two leads to under or over contracting.
2. Who controls the deliverability of my emails?
It is the most important technical question in any cold email campaign. If the agency does not manage domains, authentication (SPF, DKIM, DMARC), warm-up and sending reputation, your campaign depends on luck. The answer you want is that the agency runs a dedicated sending infrastructure. The red flag is being asked to send from your main domain, or an agency that cannot explain how it protects your reputation.
3. What data will they contact with?
List quality determines the outcome more than the copy. Ask whether they use verified, enriched data or unfiltered purchased lists. A good agency verifies every address before sending to minimize bounces. The red flag is a high expected bounce rate, especially on the first send, which betrays poor-quality lists and damages your sending reputation.
4. How will I see results?
Transparency is a good indicator of an agency’s confidence in its own work. The answer you want is access to a dashboard with real-time metrics (opens, replies, meetings, deliverability). The red flag is “we send you a report at the end of the month”, because a monthly report without detail is easy to dress up and leaves you blind to what is really happening.
5. What lock-in do you require and when will I see results?
Outbound done well shows signals in weeks, not months. Be wary of two extremes: whoever promises guaranteed instant results (they do not exist) and whoever demands long lock-ins without justification. The healthy answer is a reasonable commitment with flexibility to pause or adjust, and a realistic expectation of when you will start to see traction.
6. How do you reason about price?
Ask them to explain what the price includes and why. The answer you want is a clear amount covering team, data, technology and infrastructure, with no surprises. The red flag is an opaque price, hidden costs that appear later or a model you do not understand. As a market reference, operated B2B acquisition services tend to start from several hundred to a bit over a thousand euros per month depending on scope.
7. Do you have experience in my sector and my market?
Specialization in your vertical (SaaS, industrial, IT, finance) and your geography (Spain, LATAM) shortens the learning curve and reduces the risk of messages that do not connect. Ask for cases or concrete examples in situations similar to yours. They do not need to be identical, but they should show they understand your type of buyer and your sales cycle.
8. How do you coordinate the channels?
If the agency works several channels (email, LinkedIn, paid media, calls), ask whether it coordinates them under one strategy or treats them separately. The answer you want is a coordinated multichannel sequence, with one message adapted to each channel. The red flag is “we do email and also LinkedIn” as if they were two disconnected campaigns, because that is where the multiplier effect is lost.
9. How do you prospect while complying with GDPR?
B2B outbound is legal in Europe, but it must be done with judgment (legitimate interest, transparency, opt-out). A competent agency can explain how it complies without using the rules as an excuse not to do outbound. The red flag is no clear answer or ignoring the topic, because the compliance risk ends up being yours.
10. Are the data and the account mine?
Ask who owns the data, the domains and the account when the relationship ends. The healthy answer is that the data generated is yours and you can export and keep it. The red flag is being trapped: that when you leave you lose access to your own contacts or to the infrastructure, which ties you to the agency by dependency and not by results.
Which answers are red flags?
Beyond each question, there is a general pattern worth watching. An agency you can trust answers with specifics, with data and by acknowledging its limits (what it is good at and what it is not). An agency to distrust answers with generalities, avoids numbers, over-promises and never says “this is not for us”. Honesty about its own limitations is, paradoxically, one of the best signs of competence: only those who master their craft know where their boundaries are.
Agency or in-house team?
This is the question before choosing an agency, and the answer depends on the numbers. Building an in-house acquisition team means loaded salary cost, ramp-up time until it produces, turnover and managing all the infrastructure. An agency gives you immediate access to that capacity without a fixed structure, in exchange for a fee. The right comparison is not “which is cheaper” but “which generates opportunities more efficiently for my situation”. For many SMEs and growing companies, outsourcing acquisition is more profitable than building it from scratch. We have a specific analysis of agency versus in-house sales rep with the detailed math.
If you want to go deeper by model, channel and vertical, we have dedicated comparisons of the best B2B outbound and acquisition agencies in Spain, B2B marketing agencies for SaaS and B2B cold email agencies. When it is clear, book a demo and we will show you how we would do it in your case.
Frequently asked questions
What is the most important question when choosing a B2B acquisition agency? If you run outbound by email, who controls deliverability. It decides whether your messages reach the inbox or spam, and therefore whether the campaign works. An agency that does not manage domains, authentication and warm-up does not control its outcome.
How much should a B2B acquisition agency cost in Spain? It depends on scope. Operated acquisition services usually start from several hundred to a bit over a thousand euros per month. As a reference, Desorbitante plans start from 1,300 € per month with team, data, technology and infrastructure included, with no minimum lock-in. What matters is not the absolute price but what it includes and whether it is transparent.
How long does an outbound agency take to deliver results? Outbound done well shows signals in weeks, not months (unlike inbound, which matures more slowly). Be wary both of guaranteed instant results and of long lock-ins without justification.
Is an agency better than building an in-house team? It depends on your numbers and your stage. An in-house team gives control but means loaded cost, ramp-up and turnover. An agency gives immediate capacity without a fixed structure. For many growing companies, outsourcing is more profitable than building from scratch.
Is B2B outbound GDPR compliant? Yes, done with judgment. GDPR does not ban B2B outbound in Europe; it requires legitimate interest, transparency and an opt-out. A competent agency knows how to prospect while complying.
