Cairn is professional email built for companies that treat correspondence as part of their reputation — run on mailcairn.net infrastructure, kept deliberately unshowy.
Cairn is not trying to be everything. It is trying to be exactly right for firms whose email is part of how clients judge them.
99.98% uptime over the trailing year, with no unplanned downtime windows.
Encryption and authentication handled fully in the background, on every domain.
Designed to disappear behind the correspondence, not compete with it.
"Nothing about our switch was noticeable to clients, which was the entire point."
"We've had zero unplanned downtime in three years on Cairn."
"It is, simply, dependable — which is rarer than it should be."
Firms and professionals whose correspondence is part of how they're judged — legal, financial, and advisory practices most commonly.
Firm and Institution memberships include a dedicated onboarding session to migrate existing mail without disruption.
No — memberships are month to month, though most members stay for years.