Hello, your ingame email smtp server is wrong configured. It cannot send mails to many-many email servers such gmail.com
The reason is helo message during connection.
Here is connection log:
Jan 9 08:11:04 mail postfix/smtpd[23789]: NOQUEUE: reject: RCPT from ec2-34-234-30-69.compute-1.amazonaws.com[34.234.30.69]: 504 5.5.2 <EC2AMAZ-8RU6G5M>: Helo command rejected: need fully-qualified hostname; from=<noreply@runuo.com> to=<****@******.net> proto=ESMTP helo=<EC2AMAZ-8RU6G5M>
by RFC you need to configure smtp helo as fully-qualified hostname, for example blablabka.runuo.com.
dns name blablabka.runuo.com shiould be written in NS server , it should have ip address.
This is not only one demand to smtp server., but it's minimum.
Accepted ingame email registration
Re: ingame email registration
if you need help , i could solve it for free. (10 years mail servers building skill)