The Sendmail Transport (named Swift_SendmailTransport) is for UNIX/Linux systems which use sendmail to send emails. You will need to know where sendmail is installed in the server to use this class. The typical locations for it are “/sbin/sendmail” or “/usr/sbin/sendmail”.

Some hosts actively prevent the use of sendmail (i.e. they do not allow the program to be executed) so this transport may not work all the time. It’s also not available for use on Windows systems unless the system administrator has followed some advanced procedures to install a sendmail equivalent for windows.

Sendmail is a mail transfer agent (MTA) which spools mail to disk in order to queue it. It then tries periodically to run mail off the queue. Several other programs exist which have superceded sendmail in terms of functionality. Such programs as postfix, exim and qMail will still work with this transport since they typically provide compatibility options for sendmail.

The Swift_SendmailTransport class takes one (optional) parameter in its constructor.

Synopsis

new Swift_SendmailTransport( [ $command ] )

// or

Swift_SendmailTransport::newInstance( [ $command ] )

$command is the path to sendmail along with any flags to use. Swift Mailer supports the use of “-bs” flags and “-t”. The recommended flags are simply “-bs” since sending in this mode offers the most verbose feedback about failures during sending. The default $command is “/usr/sbin/sendmail -bs” if no other path is specified.

$sendmail = new Swift_Sendmail();
 
$mailer = new Swift_Mailer($sendmail);
 
$message = new Swift_Message('My subject', 'My message body');
$message->setFrom(array('chris.corbyn@swiftmailer.org' => 'Chris Corbyn'));
$message->setTo(array('recipient@domain.tld' => 'Recipient name'));
 
$mailer->send($message);

$sendmail = new Swift_Sendmail('/usr/sbin/sendmail -oi -t');
 
$mailer = new Swift_Mailer($sendmail);
 
//$message supports a fluid interface everywhere in Swift
$message = Swift_Message::newInstance('My subject', 'My message body')
  ->setFrom(array('chris.corbyn@swiftmailer.org' => 'Chris Corbyn'))
  ->setTo(array('recipient@domain.tld' => 'Recipient name'));
 
$mailer->send($message);

$sendmail = new Swift_Sendmail('/usr/sbin/sendmail -bs');
 
$mailer = new Swift_Mailer($sendmail);
 
$message = Swift_Message::newInstance('My subject', 'My message body')
  ->setFrom(array('chris.corbyn@swiftmailer.org' => 'Chris Corbyn'))
  ->setTo(array('recipient@domain.tld' => 'Recipient name'));
 
$mailer->send($message);

$sendmail = Swift_Sendmail::newInstance('/usr/sbin/sendmail -oi -t');
 
$mailer = new Swift_Mailer($sendmail);
 
$message = Swift_Message::newInstance('My subject', 'My message body')
  ->setFrom(array('chris.corbyn@swiftmailer.org' => 'Chris Corbyn'))
  ->setTo(array('recipient@domain.tld' => 'Recipient name'));
 
$mailer->send($message);

$sendmail = Swift_Sendmail::newInstance('/usr/sbin/exim -bs');
 
$mailer = new Swift_Mailer($sendmail);
 
$message = Swift_Message::newInstance('My subject', 'My message body')
  ->setFrom(array('chris.corbyn@swiftmailer.org' => 'Chris Corbyn'))
  ->setTo(array('recipient@domain.tld' => 'Recipient name'));
 
$mailer->send($message);

$mailer = new Swift_Mailer(new Swift_SendmailTransport());
 
$message = Swift_Message::newInstance('My subject', 'My message body')
  ->setFrom(array('chris.corbyn@swiftmailer.org' => 'Chris Corbyn'))
  ->setTo(array('recipient@domain.tld' => 'Recipient name'));
 
$mailer->send($message);