We can easily send email in joomla using $mailer = JFactory::getMailer(); which invoke jMail class. It returns a reference to the JMail object.Below is the code which define how to send an email in joomla.

 -Invoke JMail Class
$mailer = JFactory::getMailer();

-Set sender array so that from name will show  in your inbox
$mailer->setSender($from);

 -this can be a single address  or an array of addresses  of recipient
$mailer->addRecipient($to);

 -Set subject of your email
$mailer->setSubject($subject);

-set content of your email
$mailer->setBody($body);

 -If you would like to send as HTML, include this line; otherwise, leave it out
$mailer->isHTML();

-if attachment required in email
$mailer->addAttachment($file);

-Send once you have set all of your options
$mailer->send();