General Info/Mail Server CLI/ESMTP
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===== EHLO ===== | ===== EHLO ===== | ||
:The required first command, is the introduction to the mail server. You can either list a FQDN or Email address. It also lists what commands the server has available for usage. | :The required first command, is the introduction to the mail server. You can either list a FQDN or Email address. It also lists what commands the server has available for usage. | ||
| − | ehlo | + | ehlo domain.com |
| − | 250-esmail01.eservices. | + | 250-esmail01.eservices.domain.com Hello domain.com [10.45.64.3], pleased to meet you |
250-SIZE 52428800 | 250-SIZE 52428800 | ||
250-STARTTLS | 250-STARTTLS | ||
| Line 29: | Line 29: | ||
===== MAIL FROM ===== | ===== MAIL FROM ===== | ||
:Specifies who is sending the message, but not necessarily the sender of the message. I will not go into detail as more information is readily available online. | :Specifies who is sending the message, but not necessarily the sender of the message. I will not go into detail as more information is readily available online. | ||
| − | mail from:< | + | mail from:<user@domain.com> |
250 2.1.0 Sender OK | 250 2.1.0 Sender OK | ||
===== RCPT TO ===== | ===== RCPT TO ===== | ||
:Specifies who is receiving the message, but not necessarily the original recipient or CC. I will not go into detail as more information is readily available online. | :Specifies who is receiving the message, but not necessarily the original recipient or CC. I will not go into detail as more information is readily available online. | ||
| − | rcpt to:< | + | rcpt to:<user@domain.com> |
250 2.1.5 Recipient OK | 250 2.1.5 Recipient OK | ||
===== DATA ===== | ===== DATA ===== | ||
| Line 41: | Line 41: | ||
test | test | ||
. | . | ||
| − | + | 250 2.6.0 <[email protected].domain.com> [InternalId=62880244] Queued mail for delivery | |
===== QUIT ===== | ===== QUIT ===== | ||
| Line 49: | Line 49: | ||
== Full Session Example == | == Full Session Example == | ||
| − | + | ~$ telnet exchange.domain.com 25 | |
| − | Trying | + | Trying 10.45.64.2... |
| − | Connected to exchange. | + | Connected to exchange.domain.com. |
Escape character is '^]'. | Escape character is '^]'. | ||
| − | 220 exchange. | + | 220 exchange.domain.com Microsoft ESMTP MAIL Service ready at Fri, 12 Oct 2012 04:28:29 +0000 |
ehlo talladegaraceway.com | ehlo talladegaraceway.com | ||
| − | 250-esmail01.eservices. | + | 250-esmail01.eservices.domain.com Hello talladegaraceway.com [10.45.64.3], pleased to meet you |
250-SIZE 52428800 | 250-SIZE 52428800 | ||
250-STARTTLS | 250-STARTTLS | ||
| Line 73: | Line 73: | ||
data | data | ||
354 Start mail input; end with <CRLF>.<CRLF> | 354 Start mail input; end with <CRLF>.<CRLF> | ||
| − | Received: from S1P5DAG2C.EXCHPROD. | + | Received: from S1P5DAG2C.EXCHPROD.domain.com ([169.254.2.236]) by |
| − | S1P5HUB2.EXCHPROD. | + | S1P5HUB2.EXCHPROD.domain.com ([10.120.223.32]) with mapi id 14.02.0247.003; Fri, |
27 Apr 2012 23:29:55 +0000 | 27 Apr 2012 23:29:55 +0000 | ||
From: "Ricky Bobby" <[email protected]> | From: "Ricky Bobby" <[email protected]> | ||
| Line 82: | Line 82: | ||
Thread-Index: Ac0kzaXj1SGKcXxTRU21ts6UZGL4Xw== | Thread-Index: Ac0kzaXj1SGKcXxTRU21ts6UZGL4Xw== | ||
Date: Fri, 27 Apr 2012 23:29:54 +0000 | Date: Fri, 27 Apr 2012 23:29:54 +0000 | ||
| − | + | Message-ID: <[email protected].domain.com> | |
Content-Type: text/plain; charset="US-ASCII" | Content-Type: text/plain; charset="US-ASCII" | ||
| Line 94: | Line 94: | ||
Ricky Bobby | Ricky Bobby | ||
. | . | ||
| − | + | 250 2.6.0 <[email protected].domain.com> [InternalId=62880244] Queued mail for delivery | |
quit | quit | ||
221 2.0.0 Service closing transmission channel | 221 2.0.0 Service closing transmission channel | ||
Latest revision as of 22:51, 16 February 2017
Mail Server CLI | POP | IMAP | ESMTP
Contents |
[edit] ESMTP Overview
- ESMTP
- Extended Simple Mail Transport Protocol : Application layer internet standard protocol that uses TCP/IP.
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".
[edit] ESMTP Commands
[edit] EHLO
- The required first command, is the introduction to the mail server. You can either list a FQDN or Email address. It also lists what commands the server has available for usage.
ehlo domain.com 250-esmail01.eservices.domain.com Hello domain.com [10.45.64.3], pleased to meet you 250-SIZE 52428800 250-STARTTLS 250-PIPELINING 250-8BITMIME 250 HELP
[edit] AUTH LOGIN
- Only used for mail servers that require authentication, this requires that the username and password be passed to the server in BASE64 encoding. openssl is capable of encoding/decoding text to BASE64. This step is not required if you are connecting with the recipient's mail exchanger directly, IE connecting to a gmail MX to deliver a message to a gmail recipient.
- Do not use this command if you are simply trying to determine if an email address is valid and is being accepted by the MX.
auth login 334 VXNlcm5hbWU6 dXNlcm5hbWU= 334 UGFzc3dvcmQ6 cGFzc3dvcmQ= 235 2.7.0 Authentication successful
[edit] MAIL FROM
- Specifies who is sending the message, but not necessarily the sender of the message. I will not go into detail as more information is readily available online.
mail from:<[email protected]> 250 2.1.0 Sender OK
[edit] RCPT TO
- Specifies who is receiving the message, but not necessarily the original recipient or CC. I will not go into detail as more information is readily available online.
rcpt to:<[email protected]> 250 2.1.5 Recipient OK
[edit] DATA
- This is where the message is inserted, everthing including internet headers, message body, & attachments.
data 354 Start mail input; end with <CRLF>.<CRLF> test . 250 2.6.0 <0b39248e-b2fe-4454-9dc8-d0066082b054@S1P5HUB2.EXCHPROD.domain.com> [InternalId=62880244] Queued mail for delivery
[edit] QUIT
- Fairly self explanatory, terminates your session with the server.
quit 221 2.0.0 Service closing transmission channel
[edit] Full Session Example
~$ telnet exchange.domain.com 25 Trying 10.45.64.2... Connected to exchange.domain.com. Escape character is '^]'. 220 exchange.domain.com Microsoft ESMTP MAIL Service ready at Fri, 12 Oct 2012 04:28:29 +0000 ehlo talladegaraceway.com 250-esmail01.eservices.domain.com Hello talladegaraceway.com [10.45.64.3], pleased to meet you 250-SIZE 52428800 250-STARTTLS 250-PIPELINING 250-8BITMIME 250 HELP auth login 334 VXNlcm5hbWU6 cmlja3lib2JieUB0YWxsYWRlZ2FyYWNld2F5LmNvbQ== 334 UGFzc3dvcmQ6 c2hha2VhbmRiYWtl 235 2.7.0 Authentication successful mail from:<[email protected]> 250 2.1.0 Sender OK rcpt to:<[email protected]> 250 2.1.5 Recipient OK data 354 Start mail input; end with <CRLF>.<CRLF> Received: from S1P5DAG2C.EXCHPROD.domain.com ([169.254.2.236]) by S1P5HUB2.EXCHPROD.domain.com ([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: Shake & Bake Thread-Topic: Shake & Bake Thread-Index: Ac0kzaXj1SGKcXxTRU21ts6UZGL4Xw== Date: Fri, 27 Apr 2012 23:29:54 +0000 Message-ID: <3D4A65565EFB3D4B9A541F98D0DA17D7143C2010@S1P5DAG2C.EXCHPROD.domain.com> Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Hello, Shake and Bake forever! The Iron Lotus sucks. Yours Truely, Ricky Bobby . 250 2.6.0 <0b39248e-b2fe-4454-9dc8-d0066082b054@S1P5HUB2.EXCHPROD.domain.com> [InternalId=62880244] Queued mail for delivery quit 221 2.0.0 Service closing transmission channel
