---
name: "in.pop3d"
section: "8"
platform: "linux"
package: "netstd"
version: "2.08-1"
release: "Debian 1.2 (Rex)"
platforms: ["linux"]
url: "https://new.carta.tech/pop3d/8"
---

# in.pop3d(8)

remote maildrop access server

Part of [pop3d(8)](/pop3d/8.md).

## NAME

**pop3d** - remote maildrop access server

## SYNOPSIS

**/usr/sbin/in.pop3d**

## DESCRIPTION

**Pop3d** is a mailbox server based on the Internet RFC1225, Post Office Protocol Version 3. The program allows remote access to UNIX maildrops found in **/var/spool/mail**. The server requires user and password verification before a maildrop can be opened. The server can retrieve and delete messages from the maildrop on a per-message basis.

**Pop3d** listens for TCP requests on port 110. Once connected it expects single line commands terminated by a \<CR-LF\>.

**Pop3d** currently supports the following POP3 commands; the commands are case independent. In addition, the server supports one extension command, HOST, which allows access to BSMTP formatted maildrops in the directory **/var/spool/pop**.

The syntax for the HOST command is:   HOST \<hostname\>

Example:	HOST fennario.ucdavis.edu

this will open the file at /var/spool/pop/fennario.ucdavis.edu

Command	Description\
 USER		specify user for maildrop access\
 PASS		specify password for maildrop access\
 STAT		give message count and size of maildrop\
 LIST		list size of individual messages\
 RETR		retrieve a message\
 DELE		delete a message\
 NOOP		do nothing, return a positive response\
 LAST		give highest message number accessed\
 RSET		unmark messages marked for deletion\
 TOP		retrieve part of a message\
 QUIT		terminate session

The remaining optional command specified in RFC1225 (RPOP) is not implemented.

## FILES

/var/spool/mail/\*	UNIX FromSPACE delimited maildrops /var/spool/pop/\*	BSMTP formatted maildrops

## SEE ALSO

[pop2d(8)](/pop2d/8.md)

## AUTHOR

Katie Stevens, dkstevens@ucdavis.edu\
 Information Technology -- Campus Access Point\
 University of California, Davis

## NOTES

The POP3 standard supersedes Post Office Protocol Version 2 (POP2), described in RFC937.