Send Email To Smtp Server – Postmarks can be used to send email from Outlook using SMTP without affecting the ability to receive email messages on email addresses using an existing IMAP configuration. In this help article, we’ll show you how to configure the Outlook desktop client so that outgoing emails from your Outlook account are sent using a postmark. This help article uses Outlook for Mac 2016 for screenshots. The exact view may differ for other versions of Outlook.
This will open your Outlook account(s). Select the account you want to configure to send with a postmark.
Send Email To Smtp Server
For the outgoing server, enter smtp .. Set the port to 587 or 2525 and check the Override default port and Use SSL to connect boxes if they are not already checked.
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Click More Options… Get your Postmark Server API Token from the Flow Settings page for your server in Postmark. Change the Authentication field to “Username and Password” and paste your server’s API ID in the Username and Password field. Then click OK to save.
If you need to send a message via a custom message flow, you can authenticate with an SMTP token instead of your API server token. For help setting this up, see the SMTP section in our Creating and Sending Message Flows guide.
After configuring outgoing settings, send a test email from the account configured using Postmark. Emails are sent through the postmark using SMTP and can be viewed under Your Postmark Activity.
Note. The first time you send an email after changing your outgoing settings, you may be asked to re-enter your password. Re-enter the password in your API Token Server and check the option to save the password so you don’t have to enter it every time you send.
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If the test email does not go through, check your postmark activity to see if there is an SMTP API error. To send from Outlook with Postmark, the email address you are sending from must be added to your Postmark account as the sender’s signature. Let’s take a closer look at what happens “under the hood” when you send an email. This article covers the original implementation of the SMTP protocol based on research and existing documentation. Of course, SMTP has evolved over time, but this article covers the basic elements of this communication protocol.
We’ll break down our SMTP responsibilities, take a look at communication between an SMTP client and a recipient’s SMTP server, and finally use a terminal to send emails by issuing SMTP commands directly to the SMTP server.
If you’ve ever configured an email client before, you’ve probably seen terms like IMAP, POP, and SMTP. While IMAP and POP are the protocols used to retrieve emails from mailboxes, SMTP is the sending protocol. We’ll take a closer look at IMAP and POP in a separate article.
SMTP is part of the application layer of the TCP/IP protocol and traditionally runs on port 25. It uses a process called “store and forward” that is used to organize the sending of your email across different networks. Inside the SMTP protocol is a smaller software service called the Mail Transfer Agent that helps manage the transmission of email and its eventual delivery to the recipient’s mailbox. SMTP not only defines this communication flow, but can also support the delivery of delayed mail either at the sender’s site, at the recipient’s site, or at any intermediate server.
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TLDR: SMTP defines a communication protocol that determines how email travels from an email transfer agent on your computer, potentially across multiple networks, to an email transfer agent on a destination SMTP server.
User Agent (UA): Application used to send and receive email (Outlook, Mozilla, etc.). Mail Transfer Agent / Message Transfer Agent (MTA): A process running on an SMTP server that helps deliver mail to the correct recipient and manage the delivery of mail to users’ mailboxes. MTAs often help maintain a mail queue so that redelivery attempts can be scheduled in the event that the remote server is unavailable. MTAs often include specialized software called mail delivery agents or message transfer agents (MDAs) that are responsible for delivering email messages to local recipient mailboxes, while MTAs focus more on delivering email from SMTP servers. to the SMTP server.
When a user sends an email through a user agent (such as Apple’s mail application), the client’s SMTP process opens a TCP connection to an SMTP process running on any server (ie, smtp.gmail.com) on port 25. After an initial handshake, the client and server’s SMTP processes for sending an email in a short request-response dialog. We’ll take a closer look at the stream soon.
Take this basic SMTP protocol usage guide (probably for a situation where emails are sent within the same organization):
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In fact, an email message may pass through several intermediate MTAs (aka mail gateways) to be delivered to the correct recipient.
Email gateways have the added benefit of being able to handle email composed with another protocol and convert it to SMTP before transmission, or vice versa.
We’ll take a closer look at the actual commands and payloads sent between the client and the SMTP process server shortly. Before we do that, let’s take a look at how email content is structured.
An email consists of two parts – the envelope and the letter/body – just like a traditional letter.
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Envelopes contain sender and recipient fields and some additional metadata (eg timestamp, MIME attributes, etc.). Fields in the envelope section are often formatted like this:
Let’s see what modern headers look like. Here is Caviar’s promotional email header:
As you can see, header fields can contain much more than sender and receiver information; these fields are only minimum requirements.
The text below the envelope falls into the body. The body is the user-generated content of the email. The body part usually ends with a null link, a blank line, or one of several possible terminating characters (ie “.”).
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The envelope is generally sent separately from the content of the e-mail. The SMTP server first tries to validate the sender/recipient information in the header before they even consider and bother sending the email body.
This field is sent to the SMTP server using the MAIL FROM and RCPT TO commands (we’ll see more about these commands in a moment).
On the recipient’s SMTP server, it periodically checks the contents of its mailbox for new emails and forwards or sends them as needed.
As mentioned earlier, SMTP is part of the application layer of the TCP/IP protocol. Therefore, it is not surprising that SMTP uses DNS to determine the IP address of a contact’s SMTP server.
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Once the recipient’s IP address is obtained, the client’s SMTP server can connect to the remote SMTP server through a short series of sequential commands.
HELO – Helps identify the client’s SMTP process on the SMTP server and is usually followed by a qualified hostname. It is usually only sent once per session. Once this authentication step is complete, the client’s SMTP process can send as many emails as it wants.
MAIL FROM – Identifies the SMTP server that processes the sender’s email address (ie the sender of the email).
RCPT TO: After the MAIL FROM command, the client’s SMTP server can issue one or more RCPT TO commands to determine the e-mail addresses of all recipients.
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DATA: This is the command that precedes the body of the email. This is a command that tells the SMTP server that it should prepare to receive ASCII content that ends with a null line or “.”.
We will take a long look at this command in practice using Terminal, but it is important to know that this command is sent as ASCII text, which allows you to create an email client and server on any platform.
Although the list of SMTP commands is much larger than this list, the main commands are HELP, MAIL FROM, RCPT TO, DATA, and QUIT.
Once the initial handshake is complete (the HELO step), an SMTP session is started. The client first sends the corresponding sender and recipient email addresses to the SMTP server (think envelopes). After each client command, the server responds by sending “250 OK” when it receives and confirms the command. Otherwise, it will send an error message, usually prefixed with “550”.
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After receiving confirmation from these two fields, the client’s SMTP process sends the email content to the server.
Here is an example of the entire stream taken from Wikipedia. Take a moment to see – let’s try exactly this flow next using Telnet, Python and Terminal.
S: 220 smtp.example.com ESMTP Postfix C: HELLO relay.example.com S: 250 smtp.example.com nice to meet you C: EMAIL FROM: S: 250 Ok
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