Is it possible to perform an http request in common mail services?

Question

Computer networks

They asked me to find out if, after sending a letter to a mailbox (for example, gmail), it is possible to perform an http request to another site using the mail site itself?

Answer 1

In Google Docs, you can create a table to which you can attach a Googlescript, which will process all new letters according to the "crown" (configured in the gs editor). For example, such a notification on sms works for me.

function my_notification() 
{  
  var labels = GmailApp.getUserLabelByName('SMSnotify');
  
  if(labels){
    
    var threads = labels.getThreads(); 
    
    if(threads.length > 0){
    
      for(i in threads){
        
        var text = threads[i].getFirstMessageSubject();
        
        if(text[0] == 'R' && text[1] == 'e' && text[2] == ':'){
          text = text.substring(3);
        }
        text = text.trim();
        
        var maxLetters = ( /^[a-zA-Z0-9\s\^\[\]\(\)\/\*\+\-\=\|\{\}\%\,\$\#\@\&\!\?\.\,\`\~\;\:\_\<\>\"]*$/.test(text) ? 160 : 70 ) - 12;
        
        text = text.substring(0,maxLetters).trim();
    
        UrlFetchApp.fetch('http://sms.ru/sms/send?...........&text=' + encodeURIComponent(text));//тут синхронный запрос к sms.ru
      }
      
      labels.removeFromThreads(threads); //снимаем метки "SMSnotify" с цепочек
    }
  }
}

The "SMSnotify" label is attached to all new emails addressed directly to me in the gmail filter settings.

Answer 2

Well, directly, no. What is your task?
You can put the so-called pixel (link to the picture on your server) in the letter.
when a user opens this letter in a browser or mail client, a request will be made to your server, and on it you can already count the user, or something else ... you get a simple GET request.