ESP32-C3: Error connecting to smtp, notification fails

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ao16
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Posts: 21
Joined: 03 Oct 2018, 23:51

ESP32-C3: Error connecting to smtp, notification fails

#1 Post by ao16 » 15 Mar 2025, 21:07

Hi,

I cannot send notifications on a ESP32-C3 Super-Mini Board, getting following error in the Log:
"Email: Error connecting to smtp.smart-mail.de:25 Error code: 3"

I am using F/W "ESP_Easy_mega_20241222_normal_ESP32c3_4M316k_CDC.bin"
but also tried the 1st one where ESP32-C3 support was added ("ESP_Easy_mega_20230623_normal_ESP32s3_4M316k_CDC.bin")
to figure out if this error was introduced in a recent firmware version.
However the error is the same at both versions.


I configured the Email SMTP settings exactly the same way as on all my other ESP8266
and ESP32 nodes (the other ESP32 are "normal" ones, no -C3 version), copied the settings 1:1.

I searched already on the forum and saw that another user was reporting a similar issue:
viewtopic.php?t=9912#p66957
but at his side it was an issue with the WiFi router while here on my side,
all my other ESP's with ESP-Easy are working with my AP/router which leads me to the assumption
that there might be an issue with the ESPEasy ESP32-C3 firmware.

I am using smart-mail.de (Port 25) and as the ESP32 also supports SSL (Port 465)
I also tested it with GMX.de - however the failure is the same:
sending notifications via Email doesn't work anymore.

Does anyone has similar issues or an advice how to solve that issue?

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Ath
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Posts: 4330
Joined: 10 Jun 2018, 12:06
Location: NL

Re: ESP32-C3: Error connecting to smtp, notification fails

#2 Post by Ath » 15 Mar 2025, 21:16

This authentication issue has been fixed recently, but is not available in a Release yet.

Can you download your build from this GH Actions run?, where the fix is included. (You will need to be logged in to your (free) Github account to be able to download.)
/Ton (PayPal.me)

ao16
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Posts: 21
Joined: 03 Oct 2018, 23:51

Re: ESP32-C3: Error connecting to smtp, notification fails

#3 Post by ao16 » 15 Mar 2025, 21:58

Thanks a lot for this fast reply, highly appreciated!

I downloaded and flashed it on my Super-Mini-C3 and it works flawlessly !!

Thanks a lot for your hint!

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