Hi, i found this problem today:
i'm trying to send mails through your Limilabs lib, and i want to implement the 'request read receipt' function. I do it in this way
MailBuilder builder = new MailBuilder();
It WORKS, but not always (not for all receivers). For example, in some webmails the request get displayed, in some doesen't.
If receiving mails with Outlook, it does not work again.