Send Mail To Smtp Server – Postmark can use your existing IMAP settings to send email from Outlook using SMTP without affecting the address’s ability to receive email. In this help article, we’ll show you how to configure your Outlook desktop client so that outgoing email from your Outlook account is sent through Postmark. This Help article uses Outlook for Mac 2016 for screenshots. The exact views may differ for other versions of Outlook.
This will bring up your Outlook account. Select the account you set to use Postmark for sending.
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Enter smtp for published server.. set port to 587 or 2525 and check override default port and use SSL to connect if not already checked.
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Click More Options… Get your Postmark Server API token on the Stream Settings page for your server in Postmark. Change the Authentication field to ‘Username and Password’ and paste your server’s API ID into the Username and Password fields. Then click OK to save.
If you want to send your message through a specific message stream, you can authenticate using an SMTP token instead of using the server’s API token. See the SMTP section of our How to Create and Send Through Message Streams guide for help setting it up.
After you’ve configured your outgoing settings, send a test email from the account you’ve configured to use Postmark. The email is sent by Postmark using SMTP and can be viewed in your Postmark activity.
Note: The first time you send an email after changing your outgoing settings, you may be prompted to re-enter your password. Re-enter the server API ID for the password and check the option to save the password so you don’t have to type it every time you send it.
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If the test email does not complete, check your Postmark activity to see if there are any SMTP API errors. To send with Postmark from Outlook, the email address you are sending from must be added to your Postmark account as a sender signature. Learn how to send email with ESP32 using SMTP server. We show you how to send a simple email using HTML or plain text and send attachments such as images and files (
We have a similar tutorial for an ESP8266 board: Sending email with ESP8266 NodeMCU SMTP Server: HTML, text and attachments (Arduino)
And it’s the Internet standard for sending email. To send email with the ESP32, you need to connect it to an SMTP server.
To send email with ESP32 we use the ESP-Mail-Client library. This library allows the ESP32 to send and receive email with or without attachments via SMTP and IMAP servers.
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In this tutorial, we will use SMTP to send emails with and without attachments. As an example, we send an image (.png) and a text file (.txt). Files sent via email can be saved to the ESP32 file system (SPIFFS) or to a microSD card (not covered in this tutorial).
Before proceeding with this tutorial, you need to install the ESP-Mail-Client library. This library cannot be installed via the Arduino IDE library manager. Follow the next steps to install the library:
Then, if you go to File > Examples > ESP-Mail-Client, you will find some examples that you can try. You can also access the examples on the library’s GitHub page—here.
If you are using VS Code + ESP32 with PlatformIO, you need to copy the following into your platformio.ini file to include the library.
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We recommend creating a new email account to send email to your primary email address. Do not use your primary personal email address to send email through the ESP32. If something goes wrong with your code or you make too many requests by mistake, you may be banned or your account suspended.
We will use the newly created Gmail.com account to send emails, but you can use any other email service. The receiving email can be your personal email without any problems.
Create a new email account to send email with ESP32. If you want to use a Gmail account, visit this link to create a new one.
You need to create an app password so that the ESP32 can send emails using your Gmail account. An app password is a 16-character password that allows an insecure app or device to access your Google Account. Learn more about logging in with program passwords here.
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Now you need to have the app password used in the ESP32 code to send email.
If you’re using a different email provider, see How to create an app password. You can find instructions with a quick Google search on “your_email_provider + create app password”.
If you are using another email provider, you should look for your SMTP server settings. Now you are ready to start sending emails with your ESP32.
The following code sends an email through an SMTP server using either HTML or plain text. For demonstration purposes, the ESP32 sends an email once when it boots. Then you can edit the code and embed it in your own project.
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You need to enter your network information as well as set the sender’s email, SMTP server information, recipient and message.
This code is adapted from an example provided by the library. The example is well written so you understand what each line of code does. Let’s look at the relevant parts that you need or need to replace.
Enter the SMTP server settings. If you use a Gmail account to send email, these settings are:
Setup() – Set the sender name, sender email address, email subject and recipient name and message headers in the email in the following lines:
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If you want to send HTML text instead, delete the following lines – you should put your HTML text in the htmlMsg variable.
Upload the code to the ESP32. After upload, open serial screen with 115200 baud rate. Press the ESP32 reset button.
If you set the option to send messages using HTML text, the message will look like this:
In this section, we will show you how to send an attachment in your email sent by the ESP32. We show you how to send
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File with sensor readings from the last hours or send a picture taken with ESP32-CAM.
To send files via e-mail, they must be saved in the ESP32 file system (SPIFFS). We upload an image and a .txt file to the ESP32 SPIFFS using the ESP32 Filesystem Uploader plugin for the Arduino IDE. Follow the next tutorial to install the plugin if you haven’t already:
Create a new Arduino sketch and save it. Go to Sketch > Show Sketch Folder. Inside the Arduino sketch folder, create a folder called data. Move the .jpg file and the .txt file to your data folder.
After transferring the files to the data folder, in the Arduino IDE, go to Tools > ESP32 Sketch Data Upload and wait for the files to upload.
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You should get a success message in the debugger window. If the files have been uploaded, continue to the next section.
Note: If you start seeing lots of dots in the debug window and start printing …..____…..____ you need to hold the ESP32 BOOT button to load the files.
File and picture attached. Before uploading the code, make sure you have entered the sender’s email settings and the recipient’s email address.
This code is very similar to the previous one, so we will look at the relevant part for sending attachments.
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Then add attachment information: file name, MIME type, file path, file storage type, and transport encoding. In the following lines we are sending the image file.
If you want to send more attachments, you need to call the following line before adding the next attachment:
After the code is uploaded, open the serial monitor at 115200 baud rate and press the EN/RESET button on board. If everything goes well, you should get a message like this on the serial screen.
In this tutorial you learned how to send email with an ESP32 using an SMTP server. For this method to work, the ESP32 must have access to the Internet.
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If you don’t want to use an SMTP server, you can also write a PHP script to send email notifications using an ESP32 or ESP8266 board.
You have learned how to send a simple email with text and attachments. When attachments are used, they must be saved to the ESP32 file system (SPIFFS) or microSD card (not covered in this tutorial).
The examples show how to send a single email when the ESP32 boots. The idea is to modify the code and embed it in your own project. This is useful for example to send a .txt file with a sensor reading, send a picture taken with the ESP32-CAM, use deep sleep to wake up your board every hour and send an email with the data, etc.
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