Email not recieved

I am unable to revieve my email containing my upgrade password from Dusan Balara  email address removed for privacy reasons  I can and have received replies to my email to this address. They have sent three emails to my lammid@rcn. address and they are not in my inbox or spam box.  It seems that the program is blocking this specfic email.  I have also received an email from this address announcing the upgrade but with not attachments to me specifically.  How can I unblock this so I can get my upgrade password?