412 SendGrid: Invalid login: 451 Authentication failed: Maximum credits exceeded

[yousufmyk]

My Email js on Flutter Web was working fine until I downgraded the plan. Now it shows this error " 412 SendGrid: Invalid login: 451 Authentication failed: Maximum credits exceeded "Does anyone know how to fix it? I will really appreciate.

[xr0master]

As mentioned in the error message, the issue is coming from SendGrid, not from EmailJS:
SendGrid: Invalid login: 451 Authentication failed: Maximum credits exceeded

This indicates that your SendGrid account has either reached its sending limit or encountered an authentication restriction. Even though your EmailJS plan shows remaining requests, the delivery is blocked on the SendGrid side.

Please log in to your SendGrid account and check:
• If your account still has available credits.
• Whether your API key is valid and active.
• If SendGrid has applied any restrictions to your account.

Once the issue is resolved in SendGrid, emails will be sent normally via EmailJS.

[yousufmyk]

Oh my bad, I just realized