Billing department contact problem

Any e-mail sent to accounts@unrealengine.com or billing@unrealengine.com are bounced back with
----- The following addresses had permanent fatal errors -----

(reason: 554 rejected due to spam content)

----- Transcript of session follows -----
… while talking to mx-01.epicgames.com.:

DATA
<<< 554 rejected due to spam content
554 5.0.0 Service unavailable

from every mailbox i’m using. Are there any contact addresses i can e-mail to?

PS: I want to get invoice filled to my organization, how i can get an invoice?

This could be due to a possible attachment, or a flagged IP address from a specific provider. In any case, I’ll check our spam filter on this end, and let you know what I find. Thanks for the heads-up!

Hello.
There was no attachment at all. The original e-mail has been sent on Date: Thu, 8 May 2014 16:44:28 +0400 from vladik [at] d-inter.ru. Sorry for posting comment here, but with not working e-mail it seems to be plausible option. The originating IP address 195.209.232.129 is not in any known black lists too… I hope this information will help to properly identify lost e-mail.
Thank you.

Hi Vladik,

I was able to whitelist your address after scanning the e-mail you sent appropriately. You should not have any further issues.