Send Mail From Smtp Server – SMTP servers are complicated, and if you’re just dipping your toes into the world of email sending, it’s easy to feel overwhelmed. To help you navigate sending emails – specifically, SMTP servers to send emails – we’ve put together a list of the most common SMTP server questions we’ve received so you can become an SMTP expert in no time.
What does SMTP mean? We are happy to ask. SMTP stands for Simple Mail Transfer Protocol and is a program used by mail servers to send, receive and/or send outgoing mail between email senders and recipients.
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The SMTP mail server will have an address (or addresses) that the mail client or application you are using can set and will generally look like this: smtp.serveraddress.com. For example, Gmail’s SMTP server is smtp.gmail.com and Twilio’s is smtp.
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When you send email using a Gmail or AOL SMTP host, the SMTP server decodes your email, decides which server to send the message to, and sends the message to that server. The recipient’s email service provider, such as Gmail or AOL, downloads the message and places it in their inbox.
Technically, yes. Like most servers, the SMTP server processes data to be sent to other servers, but it has a specific purpose for processing data related to sending, receiving and forwarding email. An SMTP server is also optional on the machine. It is an application that runs continuously in anticipation of sending new emails.
Without an SMTP server, your email will never reach its destination. When you click Send, your email is converted into a code string that is sent to the SMTP server. The SMTP server decodes this code and sends the message. If the SMTP server wasn’t there to process the message, it would be lost in translation.
In addition, the SMTP server verifies that outgoing mail is from an active account and acts as the first line of defense to protect your inbox from illegal mail. It will also forward the email to the SMTP sender if it cannot be delivered. This informs the sender that they have entered an incorrect email address or that the email has been blocked by the recipient’s server.
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How the Twilio SMTP Server Works What does the SMTP server do when I send an email to Twilio?
Offers a free account that does not require a credit card to activate. With a free account we give you access to the SMTP server and allow you to send up to 100 emails per day – this gives you an SMTP service for testing.
Active free account customers can use their account to send test messages and test email delivery before upgrading and sending bulk emails.
Nix! All you need is an active account and the ability to use a username and password for authentication in your email client or application.
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We support unencrypted and TLS encryption on ports 25, 587 and 2525. If you want to implement SSL encryption, use port 465.
Ready to launch with Twilio? See the documentation for how to send SMTP mail. We guide you step-by-step through getting started and link to other helpful resources.
Sign up for a free account to get started. Or, if you already have an account and need help, contact support today! Learn how to send email to ESP32 via SMTP server. We show you how to send a simple email using HTML or plain text and how to send attachments such as images and files (
We have a similar tutorial for the ESP8266 board: ESP8266 NodeMCU Send Email Using SMTP Server: HTML, Text and Attachments (Arduino)
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And it is an Internet standard for sending e-mail. If you want to send email using ESP32, you need to connect it to an SMTP server.
To send mail 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.
In this guide, we use SMTP to send emails with and without attachments. For example, we send images (.png) and text files (.txt). Files sent via e-mail can be stored in the ESP32 file system (SPIFFS) or a microSD card (not covered in this guide).
Before you continue with this guide, you must install the ESP-Mail-Client library. This library cannot be installed using the Arduino IDE Library Manager. Follow these steps to install the library:
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So, if you go to File>Examples>ESP-Mail-Client, you will find several examples that you can try. You can also access the examples on the library’s GitHub page—here.
If you are using ESP32 with VS Code + PlatformIO, copy the following into the platformio.ini file to include the library.
We recommend creating a new email account to send emails to your own email address. Do not use the first private email to send email to ESP32. If there are any errors in your code, or if you make too many requests, you may be banned or your account may be temporarily suspended.
We use a newly created Gmail.com account to send email, but you can use another email provider. The recipient’s email can be your personal email without any problems.
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Create a new email account to send email with ESP32. If you want to use a Gmail account, go to this link to create a new account.
You need to create an app password for ESP32 to be able to send emails using your Gmail account. An app password is a 16-digit password that allows less secure apps or devices to access your Google Account. Learn more about accessing app passwords here.
Now you should have an application password that you will use in your ESP32 code to send emails.
If you use a different email provider, see how to create an app password. You should be able to find the instructions with a quick google search “your_email_provider + create app password”.
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If you are using a different email provider, check your SMTP server settings. Now you are ready to start sending emails to your ESP32.
The following code sends an email through an SMTP server with HTML or plain text. For demonstration purposes, the ESP32 sends an email once when it starts up. After that, you should be able to edit the code and include it in your own project.
You need to enter your network information and set the sender email, SMTP server information, recipient and message.
This code is adapted from an example from the library. The examples are well commented so you can understand what each line does. Let’s take a look at the important parts that you need or may need to change.
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Paste your SMTP server settings. If you use a Gmail account to send email, the following:
Set the message header in setup() sender-name, sender-email, e-mail subject, and the recipient’s name and e-mail to the following lines:
If you want to send HTML text instead, remove the following lines from the text – you need to put the HTML text in the htmlMsg variable.
Enter the code into the ESP32. After uploading, open the serial screen with baud rate 115200. Press ESP32 Reset button.
Configure Third Party Smtp For Outbound Emails
If you set the option to send a message with HTML text, the message will look like this:
In this section, we show you how to send attachments to emails sent by ESP32. We show you how to submit
File with the sensor readings for the last few hours or send a picture taken with the ESP32-CAM.
To send files via e-mail, they must be stored in the ESP32 file system (SPIFFS). We upload images and .txt files to the ESP32 SPIFFS using the ESP32 Filesystem Uploader plugin for the Arduino IDE. Follow the instructions below to install the plugin if you haven’t installed it yet:
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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 and .txt files to your data folder.
After moving the files into the data folder, in your Arduino IDE go to Tools > ESP32 Sketch Data Upload and wait for the files to upload.
You should get a success message in the debug window. If the files are uploaded, continue to the next section.
Note: If you start seeing a lot of dots ….____…..____ printed in the debug window, look for the BOOT button on the ESP32 to load the files.
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Files and attached images. Before sending the code, make sure you access your sender email and recipient email settings.
This code is the same as before, so we will only look at the part related to sending attachments.
Then add the attachment information: file name, MIME type, file path, file storage type, and delivery format. In the following lines we send the image file.
If you want to send multiple attachments, call the following line
Smtp Server Local Settings
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