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Wait, for w5500 I do this work that I think can be suitable also for Mega
STM32 send emails with attachments and SSL (like Gmail): w5500, enc28j60, SD, and SPI Fash
Give me a feedback Renzo
Hi Jules,
You are right, I try to upgrade the EmailSender, but for Mega I think the requirements for 587 are too high.
Keep in touch.
Bye RenzoHi Bruce,
The library supports only SSL/TLS handled on port 465, the EmailSender library doesn’t support the STARTTLS command required for port 587.
I try to upgrade in the future, but now you can check the tutorial on this site.Send emails with attachments: Arduino SAMD boards (WiFiNINA) – 3
Bye Renzo
Hi Gadzilla,
I think you use the AUX pin to wake up the Arduino, and you read the buffer immediately.
If you lost a byte, there is a problem on the transmission channel or in the wake timing; you must check the power and the wake time.
The management of send and receive is controlled by the device and work good (in general).
Bye RenzoHi Elija,
to avoid voltage drops and ensure stable power for your E220-900T30D module, don’t power it from the Arduino’s 5V pin—the onboard regulator can’t supply enough current during transmission.Instead, use a DC-DC buck converter to step down your 6V battery directly to 5V and power the E220 module from that. Add a large capacitor (470 µF + 0.1 µF) close to the E220’s VCC/GND to handle current spikes.
This setup will provide stable voltage and allow the E220 to transmit at full power without brownouts.
Bye Renzo
Hi Wany,
Generally, the problem can be generated by noise on wiring or insufficient power.I suggest performing a full connection, setting an external power supply, and then retrying.
Bye Renzo
Hi Pashazaur,
Yes, the power supply is very important for raising a good distance, and the antenna is also very important.
Bye RenzoHi Gilles,
As you write, it’s very difficult to find a provider without SSL or TSL. If I have some additional information, I will write here.
Bye RenzoHi,
I think this can be helpfull, I use GMail but I found this doc.
✅ Free SMTP Services Supporting SSL (Port 465)
🔹 Brevo (formerly Sendinblue)
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SMTP with SSL (465): ✅ Supported
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Free tier: 300 emails/day
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SMTP server:
smtp-relay.brevo.com -
Port:
465(SSL) -
Authentication: Email + API key (as password)
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Domain verification required: ✅
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Link: https://www.brevo.com
🔹 Mailjet
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SMTP with SSL (465): ✅ Supported
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Free tier: 200 emails/day (6,000/month)
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SMTP server:
in-v3.mailjet.com -
Port:
465 -
Authentication: API key + secret
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Domain verification: Recommended
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Link: https://www.mailjet.com
🔹 Elastic Email
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SMTP with SSL (465): ✅ Supported
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Free tier: ~100 emails/day (changes often)
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SMTP server:
smtp.elasticemail.com -
Port:
465 -
Authentication: Email + API Key
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Note: May require verified domain to avoid blacklisting
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Link: https://elasticemail.com
🔹 Yandex Mail (personal)
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SMTP with SSL (465): ✅ Supported
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Free tier: No public limits, but throttling may apply
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SMTP server:
smtp.yandex.com -
Port:
465 -
Authentication: Yandex username/password
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Note: Suitable for personal use — supports SSL directly
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Link: https://mail.yandex.com
Give us some feedback. Bye, Renzo
Hi pashazaur,
you can follow the steps for E32 that you can find here.Bye Renzo
Hi Zemmo,
There can be various problems, but I think a good way to do that is to change the library to use the native stack of ESP32, and you can prevent any issues with authentication.
You can find more info here.Could you give us feedback about the result and if the problem continues we are going to look into the problem in depth.
Bye Renzo
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