JSFiddle - React, Tailwind, and code Playground

HTML

<div id="start"></div>
<div id="end"></div>
<div id="mail"></div>

CSS

div { position: absolute; }
#start { width: 5px; height: 5px; background: #fbc42b; top: 250px; left: 50px; }
#end { width: 5px; height: 5px; background: #fa0218; top: 50px; left: 150px; }
#mail { width: 50px; height: 20px;  background: blue; top: 250px; left: 50px; }

JavaScript

// Init dom elements
var $start = $('#start');
var $end = $('#end');
var $mail = $('#mail');

// Get position coordinates
var startPos = $start.position();
var endPos = $end.position();

// Angle calculation
var getAngle = function(currX, currY, endX, endY) {
  var angle = Math.atan2(currX - endX, currY - endY) * (180 / Math.PI);

  if (angle < 0) {
    angle = Math.abs(angle);
  } else {
    angle = 360 - angle;
  }

  return angle;
};

// Mail angle
var getMailAngle = function() {
  var currPos = $mail.position();
  var endPos = $end.position();
  return getAngle(currPos.left, currPos.top, endPos.left, endPos.top);
};

// Animate
$mail.animate({top: endPos.top, left: endPos.left}, {
  specialEasing: {left: "easeInSine", top: "linear"},
  duration: 8000,
  // Executed each "animation" frame, so we rotate here.
  step: function() {
    var angle = getMailAngle();
    $(this).css('transform', 'rotate(' + angle + 'deg)');
  }
});