MX record blues?

[k1ll3rdr4g0n]

I know this question isn't about abyss, but its a general question :P.

Ok this problem has me stumped. If I try and send mail with the from address killerdragon[at]serversoft.us.to, the internet goes into a frenzy. Everything says the domain serversoft.us.to does not resolve. Everything ranges from my ISP SMTP server to hosting my own SMTP server.

I know for a fact it resolves, because I used dnsstuff.com ( »www.dnsstuff.com/tools/lookup.ch?name=.. ). I even have 2 MX records for it. Is there something Im missing?

P.S. Heres what QK SMTP server says whenever I try and send using a mail address with the (sub I know)domain of serversoft.us.to:

Message from: to: Direct delivery fail! 4.1.8 Domain of sender address killerdragon@serversoft.us.to does not resolve Wait for retry!

But then if I change the mail from (internet mail address) of just killerdragon heres what QK SMTP server says:

Message from: to: Direct delivery succeed!

That was using using Foxmail 5.

This is using Thunderbird 0.7.2:

Message from: to: Direct delivery fail! 4.1.8 Domain of sender address killerdragon@serversoft.us.to does not resolve Wait for retry!

With Your name: killerdragon
and Email address: killerdragon@serversoft.us.to.

And when I switch the 2 QK says this:

Message from: to: Direct delivery succeed!

Any idea at all whats going on? If your curious my ISP SMTP server says the same thing.
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