What is SendMail Application

Sendmail is a server application that gives businesses a way to send email using the Simple Mail Transfer Protocol (SMTP). It’s typically installed on an email server on a dedicated machine that accepts outgoing email messages and then sends these messages to the defined recipient. It queues messages if a recipient is not immediately available and offers authentication as a method to prevent spam. –ProofPoint: What Is Sendmail?

Sendmail is a robust MTA that Drupal can leverage to send emails either via PHP’s native mail() function or through Symfony Mailer integration. For basic setups, Drupal uses PHP’s mail() function, which relies on Sendmail if installed. For more advanced needs, configuring Symfony Mailer with Sendmail provides greater control over email formatting and delivery

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Configure Mailer with SendMail

① Install the Symfony Mailer Modules

Run the following command to install the module (as instructed on modules’s page):

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composer require 'drupal/symfony_mailer'

Enable the modules via /admin/modules page or the below drush command:

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drush pm:install symfony_mailer -y

② SendMail Executable Command

Add the following in your settings.local.php

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# Symfony Mailer module sendmail commands 
# (mailsender command for the "Symfony Mailer" module for drupal 10)
$settings['mailer_sendmail_commands'] = [
  '/usr/sbin/sendmail -t',
  '/usr/sbin/sendmail -bs',
];

③ Add Transport in Mailer Configuration

On the drupal mailer configuration page at /admin/config/system/mailer/transport, add a new entry using Sendmail transport type, use the /usr/sbin/sendmail -bs command we just added as the command to send mail with:

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④ Test Sending Email

Once setup, you may test sending email using /admin/config/system/mailer/test:

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⑤ (optional) Programmatically Send Emails

You can send emails using Symfony Mailer by creating an email object and dispatching it through Drupal’s service container. Here’s an example:

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se Symfony\Component\Mime\Email;
use Symfony\Component\Mailer\MailerInterface;

// Create an email object
$email = (new Email())
    ->from('[email protected]')
    ->to('[email protected]')
    ->subject('Test Subject')
    ->text('This is a test email.')
    ->html('<p>This is a <strong>test email</strong>.</p>');

// Retrieve MailerInterface service from Drupal
$mailer = \Drupal::service(MailerInterface::class);

// Send the email
$mailer->send($email);

Reference