An incoming mail server is the server that receives and stores emails sent to your email address so your email app (like Gmail, Outlook, or Apple Mail) can download them into your inbox.

What it actually does

  • It acts like a digital mailbox that holds all messages addressed to you until your device connects and retrieves them.
  • When someone sends you an email, their “outgoing mail server” (SMTP) forwards it to your incoming mail server, which then keeps it safe until you check your inbox.

Popular protocols behind it

Most incoming mail servers use one of two protocols:

  • POP3 (Post Office Protocol 3) : Downloads emails to your device and often deletes them from the server, so they live mainly on that one device.
  • IMAP (Internet Message Access Protocol) : Keeps emails on the server and syncs them across all your devices, so you see the same inbox on your phone, laptop, and tablet.

How it shows up in email settings

When you set up an email account on a phone or computer, you’ll usually see:

  • Incoming mail server / IMAP / POP3 server : A domain‑style address like imap.gmail.com, mail.example.com, or similar, plus a port number and security option (e.g., SSL/TLS).
  • This single field tells your email app where to “log in” and fetch your messages from the right server.

Incoming vs outgoing mail server

Role| Incoming mail server| Outgoing mail server (SMTP)
---|---|---
Main job| Receives and stores emails sent to you. 37| Delivers emails you send to others. 9
Common protocols| IMAP, POP3. 59| SMTP (Simple Mail Transfer Protocol). 9
Typical setting label| “Incoming server” / “IMAP/POP server”. 510| “Outgoing server” / “SMTP server”. 9

Information gathered from public forums or data available on the internet and portrayed here.