Try signing up using a modern up to date mail server with industry standard security.  My mail server is not able to send to email smtp servers that don't have the proper configurations.  In the last two years there have been some GLOBAL like world wide updates to the way emails get validated back to the domain registrar.  Thus, the email server you are relying upon isn't up to these standards.  That is what is happening.  The emails keep getting rejected as my email server is configured to these new standards as is required to send and receive these days.  In short try a more mainstream email account.  You are trying to be fly so low, we can not see you at all.  Yahoo Gmail, Hotmail, Proton, My, mivse.ru and various others all work fine. Try using a service that keeps up with current security as this prevents spam.  Nobody likes SPAM.  That is the motive for all of these updates, SPAM and SCAMS.  I did go through the logs and that is the feedback I have for you.