What Is POP3 (Post Office Protocol v3)?

Q: Should I use POP3 or IMAP?

For most users, IMAP is the better choice because it syncs email across all devices. POP3 is useful when you want to download emails to a single device and free up server storage, or when you need offline access to your entire mailbox without relying on a server connection.

Q: Does POP3 delete emails from the server?

By default, POP3 downloads emails and deletes them from the server. However, most email clients offer a 'Leave a copy on the server' option that keeps the original message on the server after download. This can be useful as a partial workaround, but it does not provide the full sync experience of IMAP.

POP3 is an email retrieval protocol that downloads messages from a mail server to a single device, typically removing them from the server after download.

How POP3 Works

POP3 operates on a simple download-and-delete model. Your email client connects to the mail server, authenticates, and downloads all new messages to your local device. By default, the messages are then removed from the server. This means your email exists only on the device that downloaded it.

The protocol uses a straightforward command set (USER, PASS, LIST, RETR, DELE, QUIT) and does not support server-side folders or message flags. All organization happens locally in your email client.

Why POP3 Matters

While IMAP has largely replaced POP3 for everyday use, POP3 remains relevant in specific scenarios. It is useful for archiving email to a single machine, working in environments with limited server storage, or maintaining a local backup of all messages. POP3 also uses fewer server resources since messages are removed after retrieval.

Frequently Asked Questions

Should I use POP3 or IMAP?

For most users, IMAP is the better choice because it syncs across all devices. POP3 is useful when you want to download emails to a single device and free up server storage.

What port does POP3 use?

POP3 uses port 110 for unencrypted or STARTTLS connections and port 995 for implicit TLS (POP3S). Port 995 is recommended for secure email retrieval.

Does POP3 delete emails from the server?

By default, yes. However, most email clients offer a "Leave a copy on the server" option. This keeps the original message after download, but does not provide the full sync experience of IMAP.

What Is POP3 (Post Office Protocol v3)?

POP3 is an email retrieval protocol that downloads messages from a mail server to a single device, typically removing them from the server after download.

How POP3 Works

The protocol uses a straightforward command set (USER, PASS, LIST, RETR, DELE, QUIT) and does not support server-side folders or message flags. All organization happens locally in your email client.

Why POP3 Matters

Frequently Asked Questions

Should I use POP3 or IMAP?

For most users, IMAP is the better choice because it syncs across all devices. POP3 is useful when you want to download emails to a single device and free up server storage.

What port does POP3 use?

POP3 uses port 110 for unencrypted or STARTTLS connections and port 995 for implicit TLS (POP3S). Port 995 is recommended for secure email retrieval.

Does POP3 delete emails from the server?

By default, yes. However, most email clients offer a "Leave a copy on the server" option. This keeps the original message after download, but does not provide the full sync experience of IMAP.