---
name: "popper"
section: "8"
platform: "linux"
package: "heimdal-servers"
version: "1.6~git20120403+dfsg1-2"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/popper"
---

# popper(8)

POP3 server

## NAME

**popper** – POP3 server

## SYNOPSIS

**popper** \[**-k**\] \[**-a** *plaintext**otp**sasl*\] \[**-t** *file*\] \[**-T** *seconds*\] \[**-d**\] \[**-i**\] \[**-p** *port*\] \[**-****-address-log=***file*\]

## DESCRIPTION

**popper** serves mail via the Post Office Protocol.  Supported options include:

- **-a** *plaintext**otp**sasl*

  Tells **popper** which authentication mode is acceptable, *sasl* enables SASL (RFC2222),  and *otp* enables OTP (RFC1938) authentication. Both disable plaintext passwords.

- **-****-address-log=***file*

  Logs the addresses (along with a timestamp) of all clients to the specified file. This can be used to implement POP-before-SMTP authentication.

- **-d**

  Enables more verbose log messages.

- **-i**

  When not started by inetd, this flag tells **popper** that it has to create a socket by itself.

- **-k**

  Tells **popper** to use Kerberos for authentication. This is the traditional way of doing Kerberos authentication, and is normally done on a separate port (as it doesn't follow RFC1939), and should be used instead of using SASL.

- **-p** *port*

  Port to listen to, in combination with **-i**.

- **-t** *file*

  Trace all commands to file.

- **-T** *seconds*

  Set timeout to something other than the default of 120 seconds.

## SEE ALSO

[push(8)](/push/8.md), movemail(8)

## STANDARDS

RFC1939 (Post Office Protocol - Version 3)

## AUTHORS

The server was initially developed at the University of California, Berkeley.

Many changes have been made as part of the KTH Kerberos distributions.