host     : smtp-relay.brevo.com:587
username : YOUR_BREVO_LOGIN_EMAIL
pass len : 19 chars
--------------------------------------------------
220-vmi3298253.contaboserver.net ESMTP Exim 4.99.5 #2 Sat, 29 Aug 2026 22:24:09 +0200 
220-We do not authorize the use of this system to transport unsolicited, 
220 and/or bulk e-mail.
[Gmail] 220 TLS go ahead
✅ TLS established — sending AUTH LOGIN
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[Gmail] 334 VXNlcm5hbWU6
[Gmail] 334 UGFzc3dvcmQ6
[Gmail] 535 Incorrect authentication data

❌ FAILED — Google rejected these credentials.
   Make sure:
   1. MAIL_USERNAME is the SAME account you generated the App Password from
   2. The password is exactly 16 chars, no spaces, no quotes in .env
   3. Create a FRESH app password at https://myaccount.google.com/apppasswords