64 cold email terms,
explained properly

A cold email is not a newsletter and not a flyer. It is a short, personal message to one person at one company with a single goal: a reply. Unlike ads it does not shout at an anonymous audience; it speaks to a specific business with a specific reason why you are writing to them and not to their competitor.

It works when three things line up: the target (companies that have the problem you solve), the copy (one fact, one problem, one question) and deliverability (the email actually lands in the inbox). Remove any one of them and results become random.

Inbound is content, SEO and ads: you build something that attracts customers and wait. It takes months to compound and the outcome is hard to plan. Outbound is the opposite: you choose who you want to work with and get in touch first.

The big advantage is predictability. If you know that 250 companies contacted produce 12 replies and two new clients, you know exactly how many companies to contact to keep the calendar full.

With five mailboxes and three campaigns, replies are scattered across five webmails. Unibox collects them into one list, shows the campaign and step each one responds to, and lets you reply from the same mailbox in the same thread.

A manual campaign eventually runs dry. Autopilot solves the supply: point it at a lead list (a Google Maps search, a CSV import) and set a daily cap on companies and credits, and the system works every business day. For Slovakia and Czechia it can also draw from national business directories by category.

In manual mode it prepares a batch and waits for your approval; in automatic mode it adds it to the campaign straight away.

A credit model means you pay for what you use rather than for seats or for the number of emails sent. A company with a 5-step sequence costs about 8 credits: finding, enrichment, verification and five emails.

An agency with five clients does not want campaigns to mix. Every client gets a workspace, colleagues see only what they are assigned and the client can view results read-only.

Isolation is fail-closed: a member with no assigned brand sees nothing. Permissions are checked on the server on every request, not just in the menu.

Mailbox providers read bounces as a signal that you send to a poor or stale list. One batch to an uncleaned list with 10% dead addresses can push a whole domain into spam for weeks.

Prevention is simple: verify every address before sending and never send again to an address that has bounced.

Remove hard bounces immediately; retrying only hurts reputation. A soft bounce can be retried after a day or two; if it repeats three times, treat it as hard.

Deliverability is the sum of four things: the technical setup of the domain (SPF, DKIM, DMARC), reputation (how the domain and mailbox behaved in the past), volume (how much and how regularly you send) and content (spammy words, links, images, text ratio).

The classic beginner mistake is a new domain, a new mailbox and a hundred emails on day one. Providers read that as spam and the domain carries the damage for months. Warm-up and a slow ramp-up are mandatory, not optional.

Reputation is not one number you can look up. Gmail, Microsoft and the rest compute it themselves from bounces, spam complaints, replies, opens and whether people move your emails into spam or out of it.

It takes weeks to build and a day to lose. That is why cold email should go out from a secondary domain, not the one you use with clients.

Warm-up mimics a normal person: the mailbox sends a few emails a day, gets replies, someone marks them as important. Volume rises slightly every day. After two to four weeks the mailbox has a history that providers trust.

Warm-up does not end when the campaign starts. The mailbox should keep sending and receiving warm-up messages alongside outreach so the ratio of normal to sales mail looks natural.

A typical ramp-up starts at 5 to 10 emails a day and adds a few every two or three days until it reaches the target. For a warmed-up mailbox the safe ceiling is usually 30 to 50 cold emails a day.

The limit is not about technical capacity; Gmail can push a thousand. It is about how your mailbox looks from the outside. An account that suddenly sends two hundred similar emails a day to strangers looks suspicious to filters. Fifty spread across a working day looks human.

If you need more volume, do not raise the limit; add mailboxes and let the campaign rotate between them.

Five mailboxes at 40 emails a day give you 200 emails while each one looks like a normal work account. If one mailbox sent the same amount, filters would block it within a week.

Rotation works best when mailboxes sit on two or three different domains. A problem with one domain then does not stop the whole campaign.

A person does not send 40 emails in one second. Provider filters know it, and batch sending is one of the easiest signals they use to spot spam. Random gaps within the recipient's working hours make an automation look like human work.

Without SPF anyone can put your domain in the sender field. Providers therefore distrust email without it. The record is a single TXT line in your domain's DNS listing the permitted servers.

Watch the ten-lookup limit: with several services it is easy to exceed, and the record silently stops working.

DKIM is a key pair: a private key on the server signs the emails, a public key in DNS lets the receiving server verify the signature. Since 2024 Gmail and Microsoft penalise bulk senders without DKIM heavily.

A DMARC record with at least a "none" policy has been required since 2024 for anyone sending volume to Gmail and Yahoo. "Quarantine" or "reject" protects your domain from abuse, but deploy it only after SPF and DKIM are confirmed, otherwise you block your own mail.

Reputation is tied to the domain. If a cold campaign goes wrong you do not want your invoices and client emails landing in spam. A secondary domain redirecting to your main site is cheap insurance: a few pounds a year.

Ideally two or three secondary domains with two or three mailboxes each. Rotation then spreads the volume and one troubled domain does not stop the campaign.

When thousands of users share one tracking domain, you carry everyone's reputation. Your own subdomain (for example go.yourcompany-mail.co.uk) means links in your emails point to your domain and filters judge it on its own.

Instead of watching ten mailboxes you watch one. Sending addresses have their reply-to set to the collector and the collector syncs into Unibox.

Filters today judge context, not single words, but stacking signals still hurts: three exclamation marks, two links, an image and "FREE" in the subject. A plain-text email with no links and no graphics passes almost always.

One-click unsubscribe reduces spam complaints: the person clicks "unsubscribe" in the mail interface instead of "report spam". For you that is the difference between one fewer address on the list and a damaged reputation.

A lead is not yet a prospect. It is a company that might have a reason to reply: the industry fits, so do the size, the region and ideally a visible problem (an old website, no online booking, a dead Facebook page). The tighter the leads, the higher the reply rate.

The lead list is the working unit of a campaign. One industry in one region per list: "plumbers in Greater Manchester", not "every company in the UK". Mixed lists produce mixed numbers you cannot learn anything from.

An ICP is not "every company that might want a website". It is "independent garages with 2 to 10 staff in the North West that only take bookings by phone". A description like that translates into filters, into the email copy and into expectations.

The best way to find your ICP: look at your three best clients and write down what they have in common.

From Google Maps you get a name, an address and a phone number. A good email needs more: the website (for facts), a specific email (not just info@), the name and role of a person, and a description of what the company does. Enrichment finds these on the company's site and contact page.

Verification runs in four steps: is the address well formed, does the domain have a mail server (MX), does the server confirm the mailbox exists, and is it a disposable or role address (noreply@). Addresses that fail never make it into a campaign.

Catch-all domains answer "yes, it exists" to everything, so verification cannot tell a real address from a typo. These addresses carry a higher bounce risk. Send to them in smaller numbers and watch whether they come back.

Double contact is the fastest way to look like spam. Duplicates appear easily: a different spelling of the name, a website with and without www, two addresses for the same business. Cleaning merges them by domain and email.

Your own lists (a trade show, an old CRM, a purchased database) are often the oldest and dirtiest. Verification before sending matters more on imports than anywhere else.

Maps are the best source of local businesses: restaurants, clinics, garages, tradespeople. They come with a website, a phone number and a rating that hint at size and quality. They do not include an email; enrichment finds it on the website.

Directories beat maps on structure: categories, company counts, registration numbers and often an email right in the profile. Their weakness is that they are national; in Central Europe they are excellent, elsewhere maps and websites do the job.

A business with an old website and no online booking has a visible problem you solve. The website score finds it for you and the AI can use it in the first sentence of the email.

For agencies selling social media management, a "dead profile" is exactly the trigger the email needs. For everyone else it is one more quality filter.

One email is rarely enough. People skim it, park it or forget it. A sequence solves exactly that: after the first email come two to four follow-ups, each with a new argument and in the same thread, so the reader sees the full context.

A good sequence has 3 to 5 steps spaced 3, 7 and 14 days apart. More steps mostly annoy and increase unsubscribes. The critical part is that it stops the moment the company replies, so nobody receives a nudge after they have already answered.

A follow-up is not "just checking in". Nobody reads that. A good follow-up brings something new: a reference, a concrete result, a short tip, a different angle on the same problem. The first email opens the topic, follow-ups deepen it.

Rule of thumb: every step is shorter than the previous one. The last one is two or three sentences and gives the reader a polite way to say no.

Counter-intuitively it is often the step with the highest reply rate. People dislike leaving things open, and a goodbye prompts them to either answer or close the door for good. Both are useful: you know where you stand.

It must never be passive-aggressive ("since you have not replied…"). Thank them for their time, sum up the offer in one sentence and leave the door open.

An email that arrives on Tuesday at 9:20 has a completely different chance than one that lands on Saturday at midnight and is buried under twenty others on Monday morning. The opens heatmap shows when your recipients actually read.

Five fields, ten minutes of work, and the AI has something to write from: what I sell (one sentence), to whom (ICP), what makes me different, proof (a reference, a number) and what I want the reader to do. A vague profile produces vague emails.

A name merged into a template is not personalisation; everyone spots it. Personalisation is a sentence you could not send to any other company: "I noticed you added a second lift in September." It needs a fact from the company's website and the ability to tie it to your offer.

By hand it takes ten minutes per company. That is why most people give up and send a template.

Good subject lines sound like a colleague, not an agency: "The second lift at Krajcik Car Service", "Question about online bookings". Bad ones: "Partnership opportunity", "Boost your revenue by 30%", anything with an exclamation mark or capitals.

Spintax was the answer to filters that look for a thousand identical emails. Real personalisation has replaced it: when every email is written from different facts, similarity is not a problem and spintax is unnecessary.

A template is the compromise between control and personalisation: the wording is yours, the personalised opener is added by the AI. It suits teams with proven copy or strict rules about what may be promised.

Trap: a typo in a variable ({{company}}}) or an awkward value is invisible in the editor. Previewing on two real companies before launch is mandatory.

A company that opened your email four times without replying needs a different follow-up than one that never opened it. The first is hesitating, the second never saw it. Smart rules change the focus or copy of the next step based on these signals.

Open rate tells you two things: whether the email reached the inbox at all (deliverability) and whether the subject line worked. Below 20% the problem is almost always deliverability or the subject line, not the body, which nobody saw.

Take the number with a pinch of salt. Some email clients block images (no open recorded), others such as Apple Mail preload them (a false open). Watch the trend between campaigns rather than the absolute value.

A reply is the only thing that turns into business. Campaigns are judged by reply rate and by how many replies are positive. Good B2B campaigns run at 3 to 10% replies from contacted companies, poorly targeted ones below 1%.

Reply rate rises with targeting and personalisation and falls with list size. A thousand companies with one template does worse than two hundred with an email written for each of them.

The pixel is a one-pixel image with a unique address. When the email client downloads it, the server records an open. It is not perfect: some clients block images, others (Apple Mail) prefetch them and produce a false open.

A link in the first cold email lowers deliverability and distracts from the one action you want: a reply. That is why click rate is not a headline metric in cold email. A link makes sense in a follow-up when you send a sample or a reference.

With hundreds of replies a week there is no point reading every one. Intent sorting shows you where the business is (interest and questions), what deserves a reminder in a month (later) and what can be archived straight away (auto-replies, refusals).

Test one thing at a time and let it run until you have at least a hundred companies per variant. A 2% difference on twenty emails is not a result, it is noise. The subject line and the first sentence have the biggest effect, not the colour of the signature.

Automation without a cap is dangerous: one badly configured campaign can burn a monthly budget overnight. The cap pauses the campaign and alerts you before that happens.

Every market has its own rhythm: tradespeople read email at seven in the morning and in the evening, offices between nine and eleven. The heatmap shows it from your data, not from generic advice.

When you know a campaign finishes in 12 days and brings 15 replies a week, you can plan capacity for handling replies and prepare the next lead list in time.

The digest is for the owner who does not manage the campaign daily: one glance and you know whether the engine is running, whether it delivers and whether anything needs attention.

Out of 1,000 companies found, maybe 600 actually get contacted. The funnel shows why: 150 without a website, 120 without an email, 80 failed verification, 50 already on the blocklist. Without it you would be working that out by hand.

With a 5-step sequence every company receives five emails. If you count replies per email, longer sequences look worse even though they bring more replies. Counting per company tells you what you actually care about: how many contacted companies turned into a conversation.

The blocklist is your insurance against awkward moments: an email to a current client offering what they already have, or contacting someone who unsubscribed last month. Whole company domains are blocked with a single line.

The difference from the blocklist is the origin: the suppression list is filled by the system (unsubscribes, bounces), the blocklist by you. In practice they work together: an address on either is never contacted.

An unsubscribe link is not a weakness, it protects reputation: a person without a link clicks "spam", and that hurts far more. Since 2024 Gmail and Yahoo also require one-click unsubscribe in the email header (List-Unsubscribe).

GDPR does not ban B2B cold email. It requires a legal basis (legitimate interest), transparency (who you are and where you got the contact), the right to object (unsubscribe) and proportionality (a relevant offer to a business, not spam to private individuals). With business addresses from public sources these conditions can be met.

Stricter rules apply to private addresses (an individual's gmail.com) and, in the UK under PECR, to sole traders and partnerships, who are treated like individuals. Details are in our GDPR guide.

Legitimate interest means you have a genuine business reason to contact the company (you offer something related to what it does), the contact does not burden it unreasonably and there is a simple way to say no. Keeping a short written balancing test is recommended in case of an audit.

The US CAN-SPAM Act requires a truthful header, a physical postal address and a working unsubscribe. The UK's PECR distinguishes corporate subscribers (Ltd, PLC, LLP) from individuals: corporate addresses can be emailed without prior consent, while sole traders and partnerships are protected like individuals and need an opt-in or an existing relationship.