Does cold email still work for B2B in Ireland?

Short answer: yes, for Irish B2B firms that sell to a defined list of businesses, but only when it is set up properly. What stopped working is the old way: one inbox, a bought list, the same long email to thousands of people. Gmail and Outlook now turn away mail that isn't authenticated or that people mark as spam. Campaigns that are short, aimed at the right people and sent from a clean set-up still start real conversations.

The two biggest inbox providers tightened their rules for anyone sending in volume.

• Gmail, from 2024: senders of 5,000 or more emails a day to Gmail accounts must have SPF, DKIM and DMARC set up on their domain, and keep the rate of people reporting them as spam below 0.3%. Google recommends staying below 0.1%. From November 2025 Gmail moved from warnings to slowing down and rejecting mail that doesn't meet the rules.
• Outlook, from 5 May 2025: Microsoft applies the same idea to Outlook and Microsoft 365. Domains sending more than 5,000 emails a day must pass SPF, DKIM and DMARC. Mail that fails is bounced back with an error rather than delivered.

In plain terms: if your emails are not authenticated, or enough people hit "report spam", they stop arriving. If the people you write to use Gmail, Google Workspace, Outlook or Microsoft 365, these rules decide whether your email reaches them.

Instantly, one of the larger cold email platforms, published a 2026 benchmark from its own users' 2025 sending. It found an average reply rate of 3.43%, with the top quarter of senders at 5.5% or more and the top 10% at 10.7% or more. It is one vendor's platform data, so treat it as a guide rather than a rule, but the spread is the useful part: the top 10% get about three times the replies of the average campaign.

The same report found that 58% of replies came from the first email and the rest from follow-ups, and that the best first emails were under 80 words.

A reply is not a meeting. For a buyer, the number that matters is how many qualified conversations the campaign produces each month, and what they turn into.

When a firm tells us cold email didn't work for them, the cause is usually one of these:

• Sent from the main company domain. If something goes wrong, the domain your staff and clients email from takes the damage.
• Too much, too fast. A new inbox sending hundreds of emails on day one looks like spam to Gmail and Outlook.
• The wrong list. Generic or out-of-date data means bounces, and bounces hurt delivery for every later email.
• Long emails about the sender. Three paragraphs on your history, your awards and your services, then a request for 30 minutes.
• No follow-up, or ten of them. One email and give up, or a sequence that keeps going long after the point.
• Nobody reading the replies. Interested replies sit unanswered for days, and the moment passes.

1. A separate sending set-up. Sending domains that sit apart from your main one, each with SPF, DKIM and DMARC in place, and inboxes warmed up over a few weeks before any campaign goes out.
2. Small daily volumes per inbox. Volume comes from more inboxes, not more email per inbox.
3. A short list of the right people. Named decision makers at firms that fit, with contact details checked before anything is sent.
4. Short emails about them, not you. A reason for writing that relates to their work, one line on how you help, and an easy question to answer.
5. A few follow-ups, spaced out. Each one short, and the sequence stops when they reply.
6. Replies handled the same day. Someone reads every reply, answers questions and books the interested ones into your calendar.
7. Reporting that shows meetings, not opens. Sent, replied, interested, booked, and which messages produced them.

This is how we run cold email outreach for Irish clients, and it is why a campaign takes a few weeks to set up before the first email goes out.

It works well for construction and trade firms that sell to other businesses: subcontractors looking for main contractors, suppliers looking for contractors, and specialists looking for developers and facilities managers. The buyer list is defined, decision makers are reachable, and one new relationship can be worth a lot of work over years.

One example we can share: Summit Scaffolding went from pricing around €250k of work a month to around €1m a month compared with a year earlier, and through the outreach started talking to two developers it had no previous relationship with. Keith from Summit talks about it in a video on our site.

For more on that side, see construction lead generation.

• Will you send from my main domain, or from separate sending domains?
• How many emails will each inbox send a day, and how long is the warm-up?
• Where does the contact data come from, and how is it checked?
• Who reads the replies, and how quickly are interested people booked in?
• What do you report each month, and how do you count a qualified meeting?

A good agency answers all five without hesitation. If you want to see how we would approach your market, see B2B lead generation in Ireland.