Sorry for the inconvenience of replying to this ticket (I believe this is the right place), but when I check the reverse DNS, it appears that the reverse DNS has not been set up yet.
I can see that the domain is already pointing to `65.19.191.155`, but the reverse DNS seems to point to `vps72.heliohost.us`, which may cause my emails to end up in spam folders, even though they are not spam.
Thank you very much for your help.