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Use IMAP if you check the same mailbox on multiple devices and want folders and read/unread status to stay aligned. POP3 may suit a mostly single-client workflow where you deliberately retrieve mail for local handling—but check your mail app’s settings before relying on it to keep or delete server copies. Neither protocol is a backup, and your provider must support the connection method you choose.
What is the difference between IMAP and POP3?
The main difference is how each protocol handles a mailbox. IMAP lets a mail client access and manage messages and folders on the server, then synchronize changes. POP3 is built around retrieving messages from a server maildrop; it does not define IMAP-style remote folders or shared message-state management.
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| What matters | IMAP | POP3 |
|---|---|---|
| Mailbox model | Works with server mailboxes and folders; clients can fetch selected message details or content. | Lists and retrieves messages from a server maildrop. |
| Multiple devices | Designed to let clients access the same server mailbox and resynchronize changes. | Does not provide IMAP-style shared folder and message-state management. |
| Deletion | Clients can manage messages on remote mailboxes; the result depends on the action and client behavior. | DELE marks a message for deletion during a session; it is removed when the session enters UPDATE after QUIT. |
| Offline work | The standard describes offline clients resynchronizing with the server; local availability depends on client caching. | Primarily a retrieval protocol; the standard does not define IMAP-style mailbox resynchronization. |
| Sending mail | Does not submit outgoing mail. Sending uses a submission protocol such as that specified in RFC 6409. | Retrieves mail; it is not the sending protocol. |
These differences follow the protocols’ standards: RFC 9051, IMAP4rev2 (IETF, August 2021) and RFC 1939, POP3 (IETF, May 1996). A protocol’s design does not determine every default in a particular mail app or provider account.
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Choose IMAP for the same mailbox on multiple devices
If you use a phone, laptop, and webmail to check one account, IMAP is usually the better starting point. Its server-mailbox model is designed for clients to access the same folders and message state, rather than treating each device as a separate retrieval destination.
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Consider POP3 for a primarily single-client workflow
POP3 may fit if you intentionally retrieve mail into one main client and want to handle it locally. Before setting it up, check whether the client leaves copies on the server and how it handles deletion. Those are account and client settings, not a guarantee implied by choosing POP3.
Use IMAP if you work offline and sync later
RFC 9051 explicitly describes an offline client resynchronizing with the server. Whether you can read particular messages or folders without a connection depends on what your mail client has cached.
Use neither protocol as your only backup
Synchronization and backup solve different problems. A server-centered mailbox can make the same state available across clients, but IMAP does not guarantee retention or protect you from account deletion or provider failure. Keep a separate export or backup if you need an independent recovery copy.
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Does POP3 delete emails from the server?
Not automatically in every setup. Under RFC 1939, the POP3 DELE command marks a message for deletion during the session. The server removes marked messages when the client issues QUIT and the session enters UPDATE. If the session ends without entering UPDATE, the standard says the server must not remove them.
That protocol rule does not tell you what a particular app downloads by default or whether it leaves a copy on the server. Look for settings such as keeping messages on the server, and check the provider’s guidance before using POP3 on more than one device.
How do folders, read status, and offline access differ?
IMAP treats folders as remote mailboxes that clients can access and manipulate. It also supports message flags and lets clients fetch selected attributes, text, or portions of messages. This makes it the more suitable model when you want mailbox organization and status to be available across clients.
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POP3’s standard describes listing and retrieving messages from a maildrop, not synchronizing remote folders and shared read/unread state. A client may provide its own local organization, but that is not the same as managing shared server folders through POP3.
IMAP supports offline work followed by resynchronization, as RFC 9051 states: “IMAP4rev2 also provides the capability for an offline client to resynchronize with the server.” Offline access still depends on the mail client having cached the relevant content.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should you configure either protocol securely?
Check your email provider’s current setup instructions for server names, ports, encryption mode, authentication requirements, and whether IMAP or POP3 is available for your plan and region. A protocol choice alone does not make a connection secure.
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RFC 9051 identifies port 143 as IMAP’s cleartext port and port 993 as implicit TLS, and warns that IMAP transactions—including email data—are sent in clear unless a protection mechanism is used. Follow the provider’s current secure settings instead of assuming a port or encryption mode applies to every service. TLS protects the client-to-server transport link; it is not the same as end-to-end encryption of email.
Which is better for multiple devices?
IMAP is the better starting point when multiple devices need access to the same mailbox, folders, and message state. POP3 is a narrower fit for deliberate retrieval into a primarily local or single-client setup. If you are unsure what your account supports, confirm the provider’s current options and settings before configuring your mail app.
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