当我尝试通过 laravel 6 中的 sendgrid 发送邮件时出现此错误：
Failed to authenticate on SMTP server with username "apikey" using 2 possible authenticators. Authenticator LOGIN returned Expected response code 250
我的.env：
MAIL_DRIVER=smtp
MAIL_HOST=smtp.sendgrid.net
MAIL_PORT=587
MAIL_USERNAME=apikey
MAIL_PASSWORD=***** (my key copied from sendgrid)
MAIL_ENCRYPTION=tls