How to send email programmatically in Magento 2?

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use MagentoFrameworkMailTemplateTransportBuilder;

// ...

// Get the TransportBuilder instance
$transportBuilder = $this->transportBuilder;

// Set the sender information
$transportBuilder->setFrom('sender@example.com')
    ->addTo('recipient@example.com');

// Set the subject and body of the email
$transportBuilder->setSubject('Email Subject')
    ->setBody('Email Body');

// Get the transport instance and send the email
$transport = $transportBuilder->getTransport();
$transport->sendMessage();

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use MagentoFrameworkMailTemplateSenderResolverInterface;

// ...

// Get the SenderResolver instance
$senderResolver = $this->senderResolver;

// Get the sender email and name based on the store configuration
$sender = $senderResolver->resolve('customer_support');
$senderName = $senderResolver->getSenderName('customer_support');

// Set the sender information
$transportBuilder->setFrom($sender, $senderName)
    ->addTo('recipient@example.com');

// Set the subject and body of the email
$transportBuilder->setSubject('Email Subject')
    ->setBody('Email Body');

// Get the transport instance and send the email
$transport = $transportBuilder->getTransport();
$transport->sendMessage();

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use MagentoFrameworkMailTemplateTransportBuilder;
use MagentoFrameworkAppArea;
use MagentoFrameworkAppState;

class Email
{
    protected $transportBuilder;
    protected $state;

    public function __construct(
        TransportBuilder $transportBuilder,
        State $state
    )
    {
        $this->transportBuilder = $transportBuilder;
        $this->state = $state;
    }
}

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public function sendEmail()
{
    $this->state->emulateAreaCode(Area::AREA_FRONTEND, [$this, 'sendTransactionalEmail']);
}

public function sendTransactionalEmail()
{
    $transport = $this->transportBuilder
        ->setTemplateIdentifier('your_email_template') // Replace with your email template identifier
        ->setTemplateOptions([
            'area' => Area::AREA_FRONTEND,
            'store' => MagentoStoreModelStore::DEFAULT_STORE_ID,
        ])
        ->setFrom([
            'name' => 'Sender Name',
            'email' => 'sender@example.com',
        ]) // Replace with your sender name and email
        ->addTo([
            'name' => 'Recipient Name',
            'email' => 'recipient@example.com',
        ]) // Replace with your recipient name and email
        ->setTemplateVars([
            'variable1' => 'Value 1',
            'variable2' => 'Value 2',
        ]) // Replace with your template variables and values
        ->getTransport();
    
    $transport->sendMessage();
}

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