Getting started
Your first campaign in 30 minutes
From an empty account to the first sent email. Add two to four weeks for mailbox warm-up; that runs in the background while you prepare the rest.
How to connect a mailbox (Google, Microsoft, your own SMTP)
Colldly sends through your own mailbox, so the email looks exactly as if it came from you. To connect it you need SMTP for sending and IMAP for collecting replies.
Unibox: a 15-minute daily routine for replies
A reply that waits three days is a lost deal. This routine takes 15 minutes in the morning and guarantees you answer every interested reply on the day it arrives.
Copy and sequences
How to write a cold email that gets a reply
A cold email is not a newsletter or a flyer. It is a short message to one person meant to trigger a single thing: a reply. This is the structure that works in practice.
Follow-ups that don't annoy
Most replies do not come to the first email. Follow-ups are where a campaign breaks: they either finish the deal or annoy. The difference is whether they bring something new.
The offer profile: five fields that decide the quality of every email
The AI writes exactly as well as you can say what you sell. The offer profile is five fields and ten minutes that decide every email in the campaign.
Smart rules: follow-ups based on what the recipient did
A company that opened your email four times is hesitating. A company that never opened it never saw it. Sending both the same follow-up is a waste. Smart rules change the next step based on behaviour.
Data and targeting
How to choose a target group that replies
The best copy works no miracles on a bad list. The reply rate is decided mostly by the choice of companies, not by the wording. Here is how to narrow down your target group.
How to clean your contact list
A list is not a one-off thing. Companies close, people leave and addresses stop working. A clean list is the cheapest deliverability insurance.
GDPR, PECR and cold email in the UK and EU
B2B cold email to business addresses is lawful in the UK and across the EU when it rests on legitimate interest, is transparent and is easy to opt out of. This is not legal advice; it is the set of principles we follow and that Colldly builds into every email.
Deliverability
Deliverability in practice: staying out of spam
Deliverability is not one setting but the interplay of four things: the domain's technical setup, mailbox reputation, volume and content. When one limps, all of them suffer.
Secondary domains and mailboxes: cold email infrastructure in one afternoon
Never send cold email from your main domain. This guide shows how to build, in one afternoon, an infrastructure that carries hundreds of emails a day without endangering your normal mail.
Numbers and testing
How to read campaign numbers
Numbers are not there to make you happy but to tell you what to change. Here is how to read a concrete decision out of them.
Subject line A/B test: find out what people actually open
The subject line decides the open, the open decides everything else. An A/B test is the cheapest way to stop arguing and start measuring.
The campaign is not working: a 20-minute diagnosis
The campaign has run for a week and no replies are coming. Do not rewrite the copy. Go through six checks in this order; the fault is almost always in one of the first three.
Scaling and agencies
How to scale from 50 to 500 emails a day
Scaling does not mean sending more from one mailbox. It means adding mailboxes and spreading the volume so that none exceeds its safe cap.
Autopilot step by step: from a lead list to a campaign that feeds itself
A manual campaign eventually runs dry. Autopilot takes the next portion of your lead list every working day, enriches the companies, verifies them, writes to them and sends. This guide sets it up so you can forget about it for a week.
Agencies: a client campaign from workspace to report
Five clients, five brands, five blocklists and zero mixing. This guide shows how an agency sets up a client campaign so the client checks results themselves and you scale without chaos.