To all staffs, I'm not quite sure whether to write about this or not. The reason are: I'm not sure if this is the right forum to discuss about it, and I'm not confident if it really 'a problem'. Few days ago I got notification from DigitalPoint but all of them were added into 'Spam' folder by Google Mail. It never happen before so I decided not to report it and just wait for several days to make sure this is really a problem or not. Today, I receive another notifications and all of them didn't go into 'Spam' folder. It seems all the problem already gone. Based on my early hypothesis, It though the title or content didn't pass the filter in Google mail. However, I have checked it multiple times and it seems there is no problem at all in 'Title' and 'Content' (all of them are 'standard' and usual words). Google Mail only says "It contains content that's typically used in spam messages". I'm writing this message just to inform the staff so it would not happen again in future. Just for information: I did not use any filter in my email. I never touch any setting/preferences. I believe the problem happen two days ago and did not happen again as for today.
No a lot we can do about it on our end... You can whitelist email addresses/domains from being sent to the spam folder if you want: http://email.about.com/od/gmailtips/qt/et_whitelist.htm
Thanks for the reply (and the link). I believe it is the best solution for the problem. I just wonder how it was happen. I am not asking for explanation but I only think it is weird Gmail added the message into 'Spam' Folder without my 'concern' and then label it as 'Not Spam message' again starting from today. For reference, Previous emails from DigitalPoint never go into 'Spam Folder'. The problem was happen for two days ago and already gone. I hope other didn't get the same problem. I only think maybe,... just maybe, Google already realize the mistake and label the message from DP as 'Not Spam' again.
I hope the problem did not happen again. For all member that face the same thing, I recommend to do this: Whitelist email address and Domain. Click 'Not Spam' to help Gmail team realize if it is 'Not Spam Message'. Mod could lock this thread now (if necessary).