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How Danish Lead Co. ships mailbox cohorts in roughly the time it takes to grab a coffee
Case studies · 6 min read

How Danish Lead Co. ships mailbox cohorts in roughly the time it takes to grab a coffee

Founding-customer breakdown: domains bought, DNS auto-applied, Workspace mailboxes provisioned, warm-up tracked, exported to Smartlead - all without the team touching DNS.

InboxleeInboxlee·Apr 26, 2026·6 min read

Danish Lead Co. is a Copenhagen-based lead-generation team running cold email at agency scale. Frederik Jakobsen, their Founder & CEO, was the first person to put Inboxlee through real client work - and the first to use it to ship a full cohort of mailboxes end to end.

The challenge

Every new client cohort meant a fresh stack of domains to register, DNS records to configure, mailboxes to provision, and warm-up schedules to monitor. Even a small SPF, DKIM, or DMARC mistake can quietly tank deliverability for the whole batch - and the team did not want to spend their week being part-time infrastructure engineers.

What Inboxlee handles

Inboxlee buys the domain on the cheapest registrar, applies SPF / DKIM / DMARC automatically, and provisions Google Workspace mailboxes through the official partner program. Warm-up days are tracked from the team’s sending tool API - Inboxlee monitors, the sending tool warms.

Once a mailbox is live, it’s exported into Smartlead with one click. No CSV gymnastics, no copy-paste, no DNS work to babysit.

“Inboxlee shipped our last cohort of mailboxes faster than my own team could’ve set up the DNS. Domains bought, records applied, mailboxes ready - zero hand-holding.”- Frederik Jakobsen, Founder & CEO · Danish Lead Co.

Results

  • 400 Google Workspace mailboxes provisioned through Inboxlee
  • Provisioned through the official Google partner program
  • Zero DNS edits required from Frederik’s team
  • Mailbox cohorts shipped in roughly the time it takes to grab a coffee
  • Mailboxes flow directly into Smartlead with one click

Frequently asked

How many mailboxes did Danish Lead Co. provision with Inboxlee?

400 Google Workspace mailboxes across roughly 160 domains, all provisioned through the official Google partner program. Provisioning, DNS configuration, and Smartlead export are fully automated through Inboxlee - zero DNS edits required from Frederik's team.

How long does it take to ship a cohort of cold-email mailboxes with Inboxlee?

Roughly the time it takes to grab a coffee per mailbox. Average time from order to live mailbox is ~90 seconds: domain buy, SPF/DKIM/DMARC/MX applied, Workspace mailbox provisioned, DKIM verified, credentials delivered. Cohorts of 30+ mailboxes typically ship inside 20 minutes.

What sending tool does Danish Lead Co. use with Inboxlee?

Smartlead. Inboxlee's one-click export pushes every new mailbox directly into Smartlead via API - no CSV gymnastics, no copy-paste, no per-mailbox configuration. Warmup runs in Smartlead; Inboxlee reads the curve back via the same API key.

Is Danish Lead Co. a real customer or a marketing example?

Real customer. Frederik Jakobsen, Founder & CEO of Danish Lead Co. (Copenhagen, B2B lead generation agency) is the founding cohort customer who provisioned 400 mailboxes through Inboxlee during the early-access program. Full case study at /case-studies/danish-lead-co.