2024-03-29 04:57:26 CLIENT -> SERVER: EHLO portalcucicba.com.ar 2024-03-29 04:57:26 CLIENT -> SERVER: STARTTLS 2024-03-29 04:57:27 CLIENT -> SERVER: EHLO portalcucicba.com.ar 2024-03-29 04:57:27 CLIENT -> SERVER: AUTH LOGIN 2024-03-29 04:57:27 CLIENT -> SERVER: bWlnQHBvcnRhbGN1Y2ljYmEuY29tLmFy 2024-03-29 04:57:27 CLIENT -> SERVER: MTIzbmlhZ2E= 2024-03-29 04:57:29 SMTP ERROR: Password command failed: 535 5.7.8 Error: authentication failed: UGFzc3dvcmQ6 2024-03-29 04:57:29 SMTP Error: Could not authenticate. 2024-03-29 04:57:29 CLIENT -> SERVER: QUIT 2024-03-29 04:57:29 SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting