It looks like the sending mailserver (mailer.minexpay.com) is listed on a DNS-blacklist and this is probably why .
All MX-server settings are correct. SPF & SKIM all checkout ok.
If the receiving mailserver does not check for these parameters and only uses the results from reverse-DNS to reject the email, the mail never was delivered but rejected at protocol level.
Try using a more common address like gmail (these receiving servers do implement SPF & SKIM corectly) and you will probably recieve your registration confirmation email.

I'm a sysadmin in my off-Crypto time