Scenario
How to fill a cold email campaign with verified leads
A cold email campaign is only as good as its worst address. This recipe takes you from an empty campaign to sending safely: a tightly filtered UK company list, verified published emails, an authenticated domain, automatic warm-up and a reply inbox, with your bounce rate protected at every step.
The recipe, step by step
- 1
Build a list worth emailing
Start with a Companies House search that mirrors your best customers: SIC codes, region, company age. The live preview shows the match count before you spend anything, and a focused list of a few hundred well-matched companies will outperform thousands of vaguely relevant ones on both replies and bounces.
- 2
Enrich with verified, published emails only
Tick business email and director name. Every address Leadistry delivers was published by the company itself and verified before delivery, never guessed from a name pattern, which is what keeps bounce rates low enough to protect your domain. Companies where no email can be verified auto-refund in under 60 seconds.
- 3
Check your domain before the first send
Run your sending domain through the free checker at /tools/domain-checker and fix anything missing: SPF, DKIM and DMARC records tell receiving servers your mail is genuinely yours. Sending cold email without them is how good campaigns end up in spam regardless of how clean the list is.
- 4
Let warm-up set the pace
Connect your own Microsoft 365 or Google mailbox (Growth plan and above) and let automatic warm-up ramp from 5 sends a day. Build a short sequence, an opener plus two follow-ups, add an A/B variant on the subject line, and keep sends inside UK business hours where Leadistry schedules them.
- 5
Work the replies, watch the numbers
Handle every response in the reply inbox and track opens, clicks and bounces per variant. Kill any message with a rising bounce rate immediately, promote the variant that gets replies, and push interested prospects to your CRM over webhook, Zapier or Slack so nothing warm goes cold in a mailbox.
Why this works
Cold email fails for boring, mechanical reasons: guessed addresses that bounce, unauthenticated domains that spam-filter, and cold mailboxes asked to send hundreds of messages on day one. This recipe removes each in turn: verified published emails keep bounces down, SPF, DKIM and DMARC prove you are legitimate, and warm-up plus business-hours sending builds reputation gradually. Deliverability, not copywriting, is what separates campaigns that land from campaigns that vanish.
Frequently asked questions
Why do verified emails matter so much for bounce rate?
Mailbox providers treat a high bounce rate as the signature of a spammer, and a few bad sends can hurt delivery for your whole domain. Guessed name-pattern addresses bounce constantly. Leadistry only delivers emails the company itself published, verified before delivery, so the addresses in your sequence actually exist.
Is cold email to UK companies legal?
Yes, done properly. Limited companies are corporate subscribers under PECR, so B2B marketing email does not require prior consent, provided you identify who you are and honour opt-outs. Leadistry processes register data under UK GDPR legitimate interest and honours removal requests at /remove-company within 24 hours.
How long does warm-up take before I can send at full volume?
Warm-up starts at 5 sends a day and ramps automatically as your mailbox builds reputation, no manual schedule to manage. Resist the urge to skip it: a brand-new or long-quiet mailbox that suddenly sends hundreds of messages is the clearest spam signal a provider can see.
Go deeper
Run this recipe today
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