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.