Why does email look different on each device?
If your phone shows messages that your laptop doesn’t, the devices may be using different account settings. This is especially common when an older setup uses POP and another device uses IMAP.
POP and IMAP
POP typically downloads incoming messages into a local mailbox. Depending on settings, it may leave a copy on the server or remove it. It doesn’t normally synchronize all folders and read status across devices.
IMAP keeps a server-based mailbox that clients synchronize. Devices may also download and cache messages for offline use, contrary to the original article’s claim that IMAP downloads nothing. Mozilla’s explanation describes the distinction.
Exchange and some provider-specific account types use other synchronization methods. A mismatch alone doesn’t prove that POP is the cause.
Before switching an existing account
Back up locally stored messages before removing or changing an account. Messages downloaded through POP may exist only on that computer. It can be possible to copy them into IMAP folders, subject to the app and mailbox capacity; the original claim that they cannot be uploaded was too broad.
Collect the provider’s settings
Use your email provider’s official instructions for the incoming server, outgoing SMTP server, ports, encryption, username, and authentication method. For a custom domain, your hosting control panel or administrator should supply these. Older provider names and server examples from 2018 aren’t reliable current settings.
Add the account on each device
- Open the email app’s account settings and choose to add an account.
- Select the provider when listed; otherwise use the manual option it documents.
- Choose IMAP if that is the provider-supported setup you intend to use.
- Complete sign-in or the required authorization flow. Some providers require an app password or browser-based authorization.
- Test receiving, sending, folder synchronization, and a harmless deletion across devices.
On iPhone, Android, and Outlook, the exact menus vary by software version. Use current provider instructions instead of the old Accounts and Passwords or Outlook wizard labels. Synchronization isn’t a backup: deleting a synchronized message can remove it everywhere.
