Whenever a client asks us why their email shows up on their laptop but not their phone, the answer is almost always the same: they’re on POP3 when they should be on IMAP. Let’s clear up the difference so you can make the right call.
The short version
IMAP keeps your messages on the server and mirrors them to every device. Delete a message on your phone, and it’s gone from your laptop too, because they’re both looking at the same mailbox. POP3 pulls messages down to one device and, unless you tell it otherwise, deletes the server copy afterwards.
Why IMAP is the default we recommend
Most people check email on at least two devices these days. IMAP is built for exactly that. Your Sent, Drafts and custom folders all sync, so the mailbox looks identical whether you’re in webmail, Outlook or your phone. The trade-off is that IMAP uses hosting disk space, because everything stays on the server. On a normal hosting plan that’s rarely a problem, but if you receive huge attachments daily, keep an eye on your quota.
When POP3 still makes sense
POP3 has a couple of legitimate uses. If you’re on a plan with very little email storage and you want your inbox archived locally, POP3 frees up server space. It also works better on unreliable connections, since it grabs everything in one go rather than staying connected. The catch: back up your device, because that local copy may be the only copy.
A safer POP3 configuration
If you must use POP3, at least tell your mail client to leave a copy on the server for 14 days. That way a dead laptop doesn’t take your entire email history with it. In most clients this lives under the account’s advanced settings.
Switching from POP3 to IMAP
You can’t flip a single toggle — you remove the POP3 account and re-add it as IMAP. Before you do, make sure important local-only mail is safe. The cleanest route is to keep the old POP3 account in place, add a new IMAP account alongside it, then drag your old messages into the IMAP folders so they upload to the server. Once everything’s synced, remove the POP3 profile.
If you’d like a hand planning the switch without losing mail, our team does these migrations regularly — reach out and we’ll map it out with you.
