Contact Closure Email Generator - Email Server

Hardware
1

Hello,

I’m trying and failing to use this product, and I’m hoping there’s something I’m missing. All the major email providers have discontinued the use of Username+Password authentication, so I’ve been trying to set this up to send via a self hosted email server.
Dead simple server, port 25 on the same network, no authentication required, and when I trigger the contact I get this in the logs.

[E][ssl_client32.cpp:63] handle_error(): SSL - An invalid SSL record was received
[E][ssl_client32.cpp:65] handle_error(): MbedTLS message code: -29184
[E][WiFiClientSecureESP32.cpp:179] connect(): start_ssl_client: -29184
Error sending Email, could not connect to server
Email failed with status: 3

I know the SMTP server is working because I can connect to it via telnet and it responds correctly.

I’ve already flashed the ESP32 chip with the newest code available via the Github Python script, which didn’t change anything.

2

Hi,

So I made a video a few days ago about using App Passwords for gmail. This should solve your problem: Embedded Email using Gmail App Password - YouTube

As far as your local email server, it sounds like you’re trying to use a secure connection to a server and the server doesn’t have SSL enabled correctly. This isn’t within our support wheelhouse, but generally getting SSL keys for HTTPS/SSL is tricky on an IP address. I think you’ll have to use a snake oil key or there might be a new option using letsencrypt.

3

Is it possible to use this without SSL? I have no need for it as the data isn’t sensitive, and doesn’t need encryption.

4

No we do not support SMTP Email Brokers without SSL.

5

Okay, I’ve gone through and created the Gmail account + App password. After setting that all up, I now get the following. I tried sending the email both to it’s own account, and to a company address, and got the same error both times. I can see the traffic leaving our network, and it’s not being blocked by any firewall.

I’ve also tested with both ports Gmail has used - 587 and 465

Input 1 opened
emailBuffer updated to: [“{"subject":"Input 1","body":"Closed","recipients":[""]}”,“{"subject":"Input 1","body":"Opened","recipients":["redacted@gmail.com"]}”]Error sending Email, set recipient failed
Email failed with status: 3

Edit: I’ve now also tested this account using Outlook on the same network with the same server info and credentials, which worked just fine.