The email forwarding on one of our domains, adventuretravelgroup.com, seems to have stopped forwarding some email to a gmail account. Some gets through fine from external sources (including other google accounts), but no emails originating from web forms on the server. Other emails are receiving mail from the server, so appears to be an email forwarding issue. Since it's just some of the email, we're assuming this is some kind of spam catch (though it is not going into the gmail spam folder).
It worked fine until a few weeks ago. Is there anything we can do to get it working again, reset a spam filter or something?