This is an example on how to use PHPMailer to send an HTML email. It also shows how to include a text only version of the same email for clients, such as mutt, that don’t support HTML emails.

   1  $mail = new PHPMailer();
   2  
   3  $mail->IsHTML(true);
   4  $mail->CharSet = "text/html; charset=UTF-8;";
   5  $mail->IsSMTP();
   6  
   7  $mail->WordWrap = 80;
   8  $mail->Host = "smtp.thehost.com"; 
   9  $mail->SMTPAuth = false;
  10  
  11  $mail->From = $from;
  12  $mail->FromName = $from; // First name, last name
  13  $mail->AddAddress($to, "First name last name");
  14  #$mail->AddReplyTo("reply@thehost.com", "Reply to address");
  15  
  16  $mail->Subject =  $subject;
  17  $mail->Body =  $htmlMessage; 
  18  $mail->AltBody  =  $textMessage;    # This automatically sets the email to multipart/alternative. This body can be read by mail clients that do not have HTML email capability such as mutt.
  19  
  20  if(!$mail->Send())
  21  {
  22    throw new Exception("Mailer Error: " . $mail->ErrorInfo);
  23  }

The source of the regexp is this site: Email unlimited. According to Wikipedia the regexp on the source page validates the email address according to RFC 2822 – Internet Message Format. I have still to write a comprehensive test suite, but the tests I do have for this validator pass.

   1  public class EmailValidator {
   2    public static boolean validate(final String emailAddress) {
   3      if ( emailAddress == null ) return false;
   4      String patternStr = "^[-!#$%&'*+/0-9=?A-Z^_a-z{|}~](\\.?[-!#$%&'*+/0-9=?A-Z^_a-z{|}~])*@[a-zA-Z](-?[a-zA-Z0-9])*(\\.[a-zA-Z](-?[a-zA-Z0-9])*)+$";
   5      Pattern emailPattern = Pattern.compile(patternStr);
   6      return emailPattern.matcher(emailAddress).matches();
   7    }
   8  }