Cold email borrows the format of a personal email and the reach of a newsletter, and that tension explains most of what goes wrong. Below: how a spam filter and the law tell cold email from spam, and what the first message should try to achieve.
What is a cold email?
A cold email is the first email in a business conversation that the recipient did not start. The sender has a specific reason to write to this person: their role, their company, something that changed. It is written to one person and reads like it. It is usually the first step of an email sequence, followed by a few short follow-ups if there is no answer.
The word cold describes the relationship, not the tone. The recipient has never heard of the sender, so the message has to earn trust in its first two lines.
What separates a cold email from spam?
A spam filter sees cold email and phishing as close relatives: both are unexpected, come from an unknown sender and ask for something. It separates them by format and pattern. Images, tracked links and HTML styling push a message towards spam. So do hundreds of identical copies, because a filter reads repetition across messages as bulk mail. A cold email that survives is plain text, carries at most one link, and varies its wording from recipient to recipient.
People draw the line on relevance. A finance director who receives a note about a change in their own industry reads a business message. A production worker who receives ten product features reads spam, and one click on the spam button damages the sender's domain for every later recipient.
| Cold email | Spam | Newsletter | |
|---|---|---|---|
| Recipient | One chosen person in a relevant role | Anyone with an address | People who subscribed |
| Volume | A few per mailbox per day | As many as possible | One send to the whole list |
| Format | Plain text, written to one person | Images, links, templates | Designed HTML, branded |
| Consent | Depends on country; see the legal table | None, and no relevance | Given at sign-up |
| Goal | A reply and a call | A click or a sale | Attention and repeat visits |
What should the first cold email do?
The first cold email should get a reply, nothing more. No cold email closes a deal, so a message that tries to sell in full is aiming at the wrong target. Leadspicker's guidance states it as a rule: aim for the meeting, not the deal, and write one message to one person rather than a newsletter.
- Have a reason: if you cannot say in one sentence why you are writing to this person today, you are not ready to send.
- Personalise with something real: a first name in a greeting is not personalisation. A fact about their company that shows you looked is.
- Mention the product in passing: it is context, not the subject. One sentence is enough.
- Ask for one small thing: a short call, or whether the topic is relevant at all.
- Keep it plain: a text signature, no logo, no images, one link at most. Narrow targeting does more than any of the above.
Is cold email legal in the US, UK, EU and Czechia?
The rules differ by country and by type of recipient. The table summarises what each primary text says about business recipients. It is a reading aid, not legal advice.
| What the primary text says | Source | |
|---|---|---|
| United States | No exception for business email. Every message needs an accurate sender, a postal address and an opt-out honoured within 10 business days. Penalties reach $53,088 per email. | FTC compliance guide |
| United Kingdom | Corporate subscribers, such as limited companies, can be emailed without prior consent if you identify yourself and offer an opt-out. Sole traders are treated like individuals. | ICO guide to PECR |
| European Union | Recital 47: direct marketing may be regarded as a legitimate interest. That needs a balancing test, and national ePrivacy rules still apply. | GDPR Recital 47 |
| Czechia | Section 7(2) requires prior consent for electronic commercial communications; 7(3) exempts own customers. The data protection office (ÚOOÚ) does not distinguish individuals from companies and says a published address is not consent. | Act 480/2004, ÚOOÚ FAQ |
Summaries of primary texts as published; check the current text and take advice for your own case.
Leadspicker's knowledge base frames EU outreach the same way: legitimate interest is not a blanket permission and requires outreach that is proportionate and relevant to the recipient's professional role.
What does a cold-email lead cost?
The cost of a cold-email lead is mostly infrastructure: domains, mailboxes and tooling cost the same whatever a deal is worth. So cold email pays only above a certain deal size. Leadspicker's guidance:
| Average deal size | Does cold outreach make sense? |
|---|---|
| €15 a month licences | No. The maths does not work. |
| €100 a month with strong retention | Yes, if lifetime value holds up. |
| Above €1,000 per deal | Minimum viable. |
| Around €5,000 a year | The sweet spot. |
Leadspicker knowledge base, August 2026. Pending clearance.
Internationally, the typical cost of getting one converted lead onto a call runs around €200 to 300.
Leadspicker sends cold email at five messages per mailbox per day, in plain text by design, and judges campaigns by reply rate rather than opens.
Frequently asked questions
Is cold email the same as spam?
No. A cold email goes to one chosen person in a relevant role, in plain text, at low volume, and asks for a reply. Spam goes to anyone, in bulk. A badly targeted cold email is read as spam.
Is cold email legal in the EU?
GDPR Recital 47 says direct marketing may be a legitimate interest, which needs a balancing test. National ePrivacy laws add their own rules: the ICO's PECR guidance covers email to corporate subscribers without prior consent, and Czech Act 480/2004, section 7(2), requires prior consent for commercial email.
How many cold emails should one mailbox send a day?
Leadspicker's guidance is five per mailbox per day for cold contacts. More volume comes from more mailboxes across more domains, not from pushing one mailbox harder.
- FTC, CAN-SPAM Act: A Compliance Guide for Business
- ICO, Electronic mail marketing (Guide to PECR)
- GDPR, Recital 47: Overriding legitimate interest
- Zákon č. 480/2004 Sb., o některých službách informační společnosti, § 7
- ÚOOÚ, Často kladené otázky k zákonu č. 480/2004 Sb.
- GTM playbook for 2026 by Leadspicker, chapters: chapters on writing cold outreach, sending volume, data sources and legal basis, and fit
