For reference: »An email must have a "From" or a "Sender" header.«

Thanks for the info. This is bound to come up again :)

@ipsumdolor You saved the day. I had the same problem and luckily I found your solution.

I set it in my phpunit.xml which also fixed it.

<server name="MAIL_FROM_ADDRESS" value="[email protected]"/>

Remember to run php artisan config:clear

Thank you very much! I had the same problem after upgrading to 9.x and running my tests and your post saved me a lot of time!

Same here when testing Fortify, thanks! 👍

Upss...Thanks :-)

Thank you for saving some time in troubleshooting

add mail from addres in .env file

Thank you man!

I have a passing test, then suddenly failing due to this error. This really saved me. Thanks mate! Cheers!

I'm sending notifications using standard Laravel 9.x Notifications. I have to explicitly call from method in order to avoid exception "An email must have a "From" or a "Sender" header."

/**
     * Get the mail representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return \Illuminate\Notifications\Messages\MailMessage
     */
    public function toMail($notifiable)
    {
        // TODO notification should work without explicit ->from(...)
        // currently if not present it throws exception
        return (new MailMessage)
                    ->from(config('mail.from.address'), config('mail.from.name'))
                    ->greeting('Hello ' . $notifiable->name)
                    ->line('The introduction to the notification.')
                    ->action('Notification Action', url('/'))
                    ->line('Thank you for using our application!');
    }