Ubuntu/Commands/Mail Server CLI/POP
Commands | dig | Mail Server CLI
POP | IMAP | ESMTP
Contents |
POP Overview
- POP
- Post Office Protocol : Application layer internet standard protocol that uses TCP/IP. Currently, version 3 is the standard.
Testing from a command line interface provides a virtually guaranteed way of confirming basic requirements for a successfully connection. Observations and responses observed come directly from the mail server rather than trying to interpret an application's translation of the scenario. Keep in mind that testing from a command line is generally in plain text, which is insecure, unless you use a connect application such as openssl
While much easier to test from a Linux terminal, it is possible to test from a windows command prompt, however, keep in mind that Windows does not allow you to backspace or delete any mistakes that you make. While unconfirmed, based on behavior it appears that Windows actively submits every keystroke to the mail server rather than waiting for "return".
See: RFC1939
Command Overview
USER
- Command used to pass the username.
USER username +OK
PASS
- Command used to pass the password
PASS password +OK User successfully logged on.
STAT
- Displays a list of the current messages in the mailbox and the total byte size
STAT +OK 9023 709284210
LIST
- Provides a list of all messages in the inbox and their respective byte sizes
LIST 1 14915 2 23243 3 9322 4 1778551
RETR
- Displays the message contents
RETR 1 <internet headers> <message body>
QUIT
- Closes the session with the mailserver
QUIT +OK Microsoft Exchange Server 2010 POP3 server signing off.
Full Session Example
~$ telnet exchange.postoffice.net 110 Trying 165.212.120.200... Connected to exchange.postoffice.net. Escape character is '^]'. +OK The Microsoft Exchange POP3 service is ready. USER [email protected] +OK PASS shakeandbake +OK User successfully logged on. STAT +OK 9023 709284210 LIST 1 14915 2 23243 3 9322 4 1778551 RETR 1 Received: from S1P5DAG2C.EXCHPROD.USA.NET ([169.254.2.236]) by S1P5HUB2.EXCHPROD.USA.NET ([10.120.223.32]) with mapi id 14.02.0247.003; Fri, 27 Apr 2012 23:29:55 +0000 From: "Ricky Bobby" <[email protected]> To: "Chaz Michael Michaels" <[email protected]> Subject: Bake & Shake Thread-Topic: Bake & Shake Thread-Index: Ac0kzaXj1SGKcXxTRU21ts6UZGL4Xw== Date: Fri, 27 Apr 2012 23:29:54 +0000 Message-ID: <3D4A65565EFB3D4B9A541F98D0DA17D7143C2010@S1P5DAG2C.EXCHPROD.USA.NET> Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Hello, Shake and Bake forever! The Iron Lotus sucks. Yours Truely, Ricky Bobby . QUIT +OK Microsoft Exchange Server 2010 POP3 server signing off.
