IMAP and POP3 are the two classic protocols email clients use to fetch mail, and they take opposite approaches. IMAP keeps messages on the server and syncs state across devices, so an email read on your phone shows as read on your laptop. POP3 downloads messages to one device and (by default) removes them from the server.
The right choice depends on how many devices you use and whether you want a server-side backup. IMAP suits modern multi-device life; POP3 suits single-device setups or those wanting local-only storage.
At a glance
Aspect
IMAP
POP3
Storage
Server-side, synced
Downloaded to one device
Multi-device
Yes — consistent everywhere
Poor — state not synced
Server copy
Kept
Removed by default
Offline access
Cached copies
Full local copies
Best for
Multiple devices, webmail parity
Single device, local archiving
When to use IMAP
You check email on several devices.
You want read/unread and folder state synced everywhere.
You want mail backed up on the server.
When to use POP3
You use a single device and want local storage.
You have limited server storage to conserve.
You prefer messages downloaded and off the server.
Verdict
For almost everyone today, IMAP is the right default — it keeps every device in sync and leaves a server-side copy. POP3 remains useful only for single-device workflows or when you deliberately want mail pulled down and removed from the server. If you switch a mailbox from POP3 to IMAP, reconcile local archives first so you don't lose messages already downloaded.
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