SMTP Client


To show the basics of sending an email via SMTP


When an IOT device detects a malfunction, it is good to be able to notify the user. We can do that either by sending them an email or via a service like MQTT.

This sample shows how to send an email via SMTP directly from the ESP8266.

smtp2go conveniently provides a free account.

Create an account here: .

It needs some configuration: * the name of the SMTP server, eg “” * a username and password * the name and email of the person from whom the email will be sent * the name and email of the person to send the email to

Edit the sample to replace these values and the SSID etc.


SoC support

  • esp32

  • esp32c2

  • esp32c3

  • esp32s2

  • esp32s3

  • esp8266

  • host

  • rp2040