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Case study · Client D

Moving more than 100 mailboxes and 38 domains without losing email

Twice we moved a whole group of clients at once. In 2023 we moved the email of 22 organisations, at least 117 mailboxes, off an ageing server in eight weeks. In 2026 we moved about 28 websites to new hosting and 38 domains to Cloudflare.

  • Client DMany of our hosted clients at once
  • 2023 and 2026When
  • RunServices

117mailboxes moved for 22 organisations in 2023

Largest client, one weekend: 3421 other organisations: 83

The situation

In 2023 our clients’ email sat on one shared server with small mailboxes. The server was ageing and had to be switched off.

By 2026 client websites and domain settings were spread across older hosting and several providers. Changes were slow, and some clients controlled their own settings.

In both moves the clients’ email had to keep working. One wrong domain setting means bounced mail.

What we did

Run

Move every mailbox, with its old mail

When email moves, every address has to keep receiving mail. Old mail has to come across too, or staff lose their records.

  • Wrote to every client first, then set a clear switch-off date for the old server.
  • Set up a separate Zoho Mail account for each client and moved each mailbox’s mail across. Very large mailboxes were split into current and archive boxes.
  • Moved the largest client, 34 mailboxes, over one weekend. Monday started normally.
  • Sent every client a completion notice with a how-to guide, and solved the stalled moves one by one.

Run

Move websites and domains, one at a time

A domain’s settings tell the internet where to deliver email and where to find the website. Switch them before the new home is ready and email bounces.

  • Listed every site and what it depends on, then moved about 28 sites to new hosting and set up a security certificate on each.
  • Copied each domain’s records from two sources and checked them on Cloudflare before switching anything. The old records stayed in place in case we needed to switch back.
  • Asked clients who held their own settings to hand them over. Future changes now take minutes.
  • Left one domain where it was on purpose. It runs a live app across several servers and needs its own plan.

Results

  • 22 organisations and at least 117 mailboxes moved to a new email platform between 27 April and 20 June 2023.
  • The old server retired on schedule, with a backup kept of anything not moved.
  • About 28 websites moved to new hosting in 2026.
  • 38 domains moved to Cloudflare in 2026, with no reported email loss.

We describe this client by what it does rather than by name, to respect its confidentiality.

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