Email Services Compatible with Arduino (Without SSL) october 2025 update

✅ WORKS: Brevo (formerly Sendinblue) – RECOMMENDED

// Brevo supports port 587 WITHOUT SSL (AUTH LOGIN only)
EMailSender emailSend("your-api-key@smtp-brevo.com",  // Login
                      "your-api-password",              // Password
                      "verified@yourdomain.com",        // From (must be verified)
                      "Arduino Mega",                   // Sender name
                      "smtp-relay.brevo.com",           // Server
                      587);                             // Port 587 (AUTH LOGIN)

Brevo Advantages:

✅ Port 587 without SSL – Perfect for Arduino
✅ 300 emails/day free – Generous free plan
✅ API key instead of password – More secure
✅ Great for IoT – Designed for automated sending
Sign up: https://www.brevo.com

✅ WORKS: SMTP2GO

// SMTP2GO supports port 2525 without SSL
EMailSender emailSend("your-smtp2go-username",
                      "your-smtp2go-password",
                      "verified@yourdomain.com",
                      "Arduino Mega",
                      "mail.smtp2go.com",
                      2525);                            // Port 2525 (no SSL)

SMTP2GO Advantages:

✅ Port 2525 without SSL – Alternative to 587
✅ 1000 emails/month free
✅ Excellent deliverability
Sign up: https://www.smtp2go.com

✅ WORKS: Mailgun (SMTP API)

// Mailgun port 587 without SSL
EMailSender emailSend("postmaster@your-domain.mailgun.org",
                      "your-mailgun-password",
                      "verified@yourdomain.com",
                      "Arduino",
                      "smtp.mailgun.org",
                      587);

Mailgun Advantages:

✅ 5000 emails/month free for 3 months
✅ Great for developers
Sign up: https://www.mailgun.com