Laravel - Sendgrid smtp error “550 Unauthenticated senders not allowed”

Question

I am following Sendgrid laravel integration using smtp to send email.

I did as the documentation says, all credentials are same as my sendgrid credentials.

But w

Answer 1

"550 Unauthenticated senders not allowed" explicitly means that you're system is not attempting to Authenticate. So you're not actually sending your credentials through. You should review your Laravel configuration, and make sure that it will send the AUTH command before sending the MAIL FROM: command.