I just found a problem with the board, or may be the email address set by admin in "from" field (I think you are using vBulletin so I hope you know where to set this option in AdminCP), is now pushing mails to spam folders. At Gmail I was looking into spam folder to check if one of mails did end up there, and I found mail from Encode's topic reply to freearc topic. then I moved mail to inbox and when read it had a notification. Here is the top of the mail:
And when viewed the original header the From: header contains:
From: "ENCODE.DREAMHOSTERS.COM FORUM" <ilia_muraviev@.........>
(......... is domain, to not let your email go into hands of spammers)
I hope you change it, so that we do not miss any reply or new topic.
regards