{"id":4516,"date":"2026-10-12T12:58:38","date_gmt":"2026-10-12T10:58:38","guid":{"rendered":"https:\/\/www.klytic.com\/cloud-dedicated-or-on-premises-email\/"},"modified":"2026-10-12T13:31:46","modified_gmt":"2026-10-12T11:31:46","slug":"cloud-dedicated-or-on-premises-email","status":"publish","type":"page","link":"https:\/\/www.klytic.com\/en\/cloud-dedicated-or-on-premises-email\/","title":{"rendered":"Cloud email, dedicated email or email on your premises"},"content":{"rendered":"\t\t
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Home<\/a>\u203a<\/span>Guides<\/a>\u203a<\/span>Email<\/a><\/p>

Email \u00b7 Understand<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Cloud email, dedicated email or email on your premises<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A business email system can run on a platform shared between customers, on an instance reserved for your organization, or on a server installed on your premises. Where the machine sits changes less than people think: what matters is who operates it, who can open a mailbox, and how you get out. Self-hosting gives you physical control; it does not solve operations, nor does it alone ensure sovereignty.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Updated October 2026<\/b><\/span>8 min<\/b><\/span>Official sources cited<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Three operating models<\/h2>

People often talk about \u201ccloud\u201d versus \u201con-premise,\u201d as if there were two camps. In practice, three models coexist, and they are distinguished by two questions: where the machine runs, and who runs it.<\/p>

Operating an email system<\/strong> means applying updates, monitoring the queue and disk space, renewing certificates, backing up, restoring, responding to an incident at 7 a.m. and maintaining the domain\u2019s sending reputation. Hosting only means providing the machine and the network.<\/p><\/div>

Managed cloud<\/h3>

The provider runs the entire platform. It is generally shared between several customers, with logical separation: each organization sees only its own domains and mailboxes, but the servers, storage and operations teams are shared. It is the simplest model to get started with and the cheapest to run.<\/p>

Dedicated email<\/h3>

An instance or a server is reserved for your organization. Your data is not stored alongside that of any other customer. The provider still operates it: you are buying isolation, not a workload. This model suits regulated sectors, large volumes, groups that want to clearly separate their companies, or settings that a shared platform cannot grant to a single customer.<\/p>

Email on your premises<\/h3>

The machine is on your site, in your server room or your data center. Yet someone has to operate it. Either your team does it, or a provider does it remotely, with access you grant. Both choices are legitimate; they do not cost the same and do not provide the same recovery guarantees.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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What really changes<\/h2>

Five points distinguish the three models. The others, such as webmail or Outlook compatibility, depend mainly on the software, not on the location.<\/p>

Point<\/th>Managed cloud<\/th>Dedicated<\/th>On your premises<\/th><\/tr><\/thead>
Neighbors<\/td>Shared platform, logical separation<\/td>No other customer on the instance<\/td>Your network, your other servers<\/td><\/tr>
Updates<\/td>The provider, on its schedule<\/td>The provider, schedule sometimes negotiable<\/td>Your team or the appointed provider<\/td><\/tr>
Backups<\/td>At the provider, under its contract<\/td>At the provider, sometimes dedicated<\/td>To be organized: where, by whom, off site?<\/td><\/tr>
Who can open a mailbox<\/td>Your administrators and the operator<\/td>Your administrators and the operator<\/td>Your administrators, and the operator if there is one<\/td><\/tr>
Exit<\/td>Export and MX change<\/td>Export and MX change<\/td>Export, MX change, and the machine to repurpose or recycle<\/td><\/tr><\/tbody><\/table><\/div>

Neighbors<\/h3>

On a shared platform, a spam campaign sent from another customer\u2019s compromised account can damage the reputation of the shared sending IP address. A dedicated instance, or a dedicated IP address, isolates this risk. On your premises, the neighbor is your own network: an infected workstation can reach the server if it is not segmented.<\/p>

Who can open a mailbox<\/h3>

This is the line people fill in too quickly. Whoever can restore a mailbox can read it, whatever the model. Location does not remove this access; it only changes the list of people who have it. The useful questions are therefore: who holds the administration accounts, are these accesses named and logged, and does the contract prohibit the operator from opening a mailbox except at the customer\u2019s request. Only end-to-end encryption, for which you keep the private key, for example with S\/MIME, makes the content of a message unreadable for the operator.<\/p>

Exit<\/h3>

The domain name must remain in your name: its MX record designates the server that receives your mail, and you must be able to change it without asking for permission. The rest has to be prepared: export of mailboxes in a standard format, including calendars and contacts, export lead time, deletion after the end of the contract.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Self-hosting is not enough for sovereignty<\/h2>

Putting the server on your premises answers one specific question: where the disks physically are. The guide what is a sovereign cloud<\/a> points out that at least three others remain: which company operates it, which law applies to that company, and how you get out.<\/p>

A server within your walls can thus remain dependent on outside parties without it being visible:<\/p>