Doesn't send email

/* ESP8266 Moisture Sensor
   This sketch uses an ESP8266 to read the analog signal from a moisture sensor. The data is then displayed
   using the serial console or a web browser. Based on the moisture reading, the ESP8266 will blink a RGB LED
   red, green or blue.

   Red = Dry
   Green = In between Wet and Dry
   Blue = Wet

     Viewing the data via web browser by going to the ip address. In this sketch the address is
     http://192.168.1.221

      The browser data includes a Google Chart to visually illustrate the moisture reading as a guage.

   ///////////////////////////////////////
   Arduino IDE Setup
   File:
      Preferences
        Add the following link to the "Additional Boards Manager URLs" field:
        http://arduino.esp8266.com/stable/package_esp8266com_index.json
   Tools:
      board: NodeMCU 1.0 (ESP-12 Module)
      programmer: USBtinyISP


  ///////////////////////////////
*/
#include <ESP8266WiFi.h>
#include "ESPMailer.h"
#include <Time.h>
#include <NTP.h>

const char* ssid = "*";
const char* password = "*";

bool sendEmail=false, mailSent=false, diagnosticMode=false;

int WiFiStrength = 0, numeroErroriInvioEmail=0;

WiFiServer server(80);

void setup() {
  Serial.begin(115200);
  delay(10);

  pinMode(4, INPUT);
  pinMode(16, INPUT);




  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  // Set the ip address of the webserver
  // WiFi.config(WebServerIP, Gatway, Subnet)
  // or comment out the line below and DHCP will be used to obtain an IP address
  // which will be displayed via the serial console

  WiFi.config(IPAddress(192, 168, 1, 221), IPAddress(192, 168, 1, 1), IPAddress(255, 255, 255, 0));

  // connect to WiFi router
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");

  // Start the server
  server.begin();
  Serial.println("Server started");

  // Print the IP address
  Serial.print("Use this URL to connect: ");
  Serial.print("http://");
  Serial.print(WiFi.localIP());
  Serial.println("/");

}

double analogValue = 0.0;
double analogVolts = 0.0;


void loop() {
yield();

  WiFiStrength = WiFi.RSSI(); // get dBm from the ESP8266
  analogValue = analogRead(A0); // read the analog signal
  int  digitalValue=digitalRead(4);  //leggi sensore

  if(digitalValue==1) sendEmail=true;
  if(digitalRead(16)) diagnosticMode=true;
    else diagnosticMode=false;
  // convert the analog signal to voltage
  // the ESP2866 A0 reads between 0 and ~3 volts, producing a corresponding value      sbagliato! legge tra 0 e 1V
  // between 0 and 1024. The equation below will convert the value to a voltage value.



  analogVolts = (analogValue * 3.08) / 1024;




  // Serial data
  Serial.print("Analog raw: ");
  Serial.println(analogValue);
  Serial.print("Analog V: ");
  Serial.println(analogVolts);
  Serial.print("millis(): ");
  Serial.println(millis());
  Serial.print("WiFi Strength: ");
  Serial.print(WiFiStrength); Serial.println("dBm");
  Serial.print("digitalValue: ");
  Serial.println(digitalValue);
  Serial.print("sendEmail: ");
  Serial.println(sendEmail);
  Serial.print("mailSent: ");
  Serial.println(mailSent);
  Serial.print("numeroErroriInvioEmail: ");
  Serial.println(numeroErroriInvioEmail);
  Serial.print("diagnosticMode: ");
  Serial.println(diagnosticMode);
  Serial.println("");
  delay(1000); // slows amount of data sent via serial

  if(diagnosticMode==true){
  // check to for any web server requests. ie - browser requesting a page from the webserver
  WiFiClient client = server.available();
  if (!client) {
    return;
  }

  // Wait until the client sends some data
  Serial.println("new client");

  // Read the first line of the request
  String request = client.readStringUntil('\r');
  Serial.println(request);
  client.flush();

  // Return the response
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println(""); //  do not forget this one
  client.println("<!DOCTYPE HTML>");

  client.println("<html>");
  client.println(" <head>");
  client.println("<meta http-equiv=\"refresh\" content=\"60\">");


  client.println("  </head>");
  client.println("  <body>");

  client.print("<h1 style=\"size:12px;\">ESP8266 Pagina Diagnostica</h1>");

  // show some data on the webpage and the guage
  client.println("<table><tr><td>");

  client.print("Potenza segnale WiFi: ");
  client.println(WiFiStrength);
  client.println("dBm<br>");

  client.print("Analog Raw: ");
  client.println(analogValue);
  client.print("<br>Analog Volts: ");

  client.print(analogVolts);
  client.println("V<br>");

  client.print("Uptime: ");
 long int tempo=millis();
 long int secondi=(tempo/1000)%60;
 long int minuti=(tempo/60000)%60;
 long int ore=(tempo/3600000)%24;
 long int giorni=tempo/86400000;
  client.print(giorni);
  client.print("D ");
  client.print(ore);
  client.print("H ");
  client.print(minuti);
  client.print("m ");
  client.print(secondi);
  client.println("s<br>");

  client.print("sendEmail: ");
  client.print(sendEmail);
  client.println("<br>");

  client.print("Tentativi di invio email falliti: ");
  client.print(numeroErroriInvioEmail);
  client.println("<br>");

  client.println("<br><a href=\"/REFRESH\"\"><button>Refresh</button></a>");

  client.println("</td><td>");


  client.println("</body>");
  client.println("</html>");
  delay(1);
  Serial.println("Client disconnected");
  Serial.println("");
 // yield();
  }


  if(sendEmail==true && mailSent==false){
    yield();
    Serial.println("Tentativo invio email in corso");
  ESPMailer* mail = new ESPMailer();

  mail->setDebugLevel(0);
  mail->Host = "mail.vfemail.net";
  mail->Port = 587;
  mail->SMTPAuth = true;
  mail->AuthType = LOGIN;
  mail->Username = "*";
  mail->Password = "*";
  mail->setFrom("*","ESP8266 Example Mailer");
  mail->setTimezone(1); //defaults to UTC
  mail->addAddress("*");
//  mail->addBCC("bcc@example.org");
  mail->Subject = "Test!";
  mail->isHTML(true);
  mail->Body = "<html><body>Hello <strong>ESP</strong> user!</body></html>";
  mail->AltBody = "Hello ESP user!";
  if (mail->send()){
    mailSent=true;
    Serial.println("Mail sent sucessfully!");
}
else {
  numeroErroriInvioEmail++;
  Serial.println("errore nell'invio dell'email");
}
  }
}