I'm not able to sent email, but I know why!

The email server of gpucoin.net is misconfigured.

mail.gpucoin.net must point to an IP address. Instead it point to gpucoin.net

You can check it here:

http://www.kloth.net/services/nslookup.php

 Non-authoritative answer:
 mail.gpucoin.net    canonical name = gpucoin.net

According to http://www.rfc-editor.org/rfc/rfc2181.txt it's prohibited to do this:

"To resolve the CNAME, the sender's DNS server will have to perform a second query.

Not only is that inefficient, it is in fact explicitly prohibited by RFC 2181."


Most email providers ignore this error, do the second query and sent the email.

But some adhere 100% to the specification and will not sent your email to ipo@gpucoin.net, but give the "domain has no mail exchangers" error until the author fixed the problem.

The two largest German mail providers gmx.de/gmx.net and web.de adhere 100% to the rules, and you (and I) will not able to sent email to ipo@gpucoin.net until GPUCoin configures their domain properly.