[MODULE] xBilling

[Fuzzy]

Thank you and should this work?Or do I have to do each port individually?

https://www.centos.org/forums/viewtopic.php?t=30388
I disabled the firewall. Can you try to sign up again?

Well the MX tool testing website connects succesfully to the server so I'm guessing it's not a port issue.
Having said that it won't connect to your "support@xbilling.....tk" address that you're using in the xbilling module so I'm gonna hazard a guess as maybe it's sending e-mails from that subdomain? If so you'll you need to setup MX/mail DNS records for the xbilling subdomain to point at the same place as your standard domain. I could be wrong but it's all I can think of at the moment. :/

Example:
example.com
MX point to SERVER IP ADDRESS

xbilling.example.com
MX point to SERVER IP ADDRESS

EDIT: I noticed it's a CNAME so it shouldn't actually make a difference with the MX record, back to square one again it seems, I'm just coming up with ideas here haha