This is a feature request (maybe a bug fix depending on how you look at
it), to improve the Notifications.
In Google's Bulk Senders Guidelines, they mention:
"Messages should indicate that they are bulk mail, using the 'Precedence: bulk'
header field."
https://support.google.com/mail/answer/81126?hl=en
This triggers Google's Smart Labels feature to label the messages as
bulk. Because SOGo currently fails to label bulk emails with this
header, it's more likely that Google will send SOGo's Notification
messages to the recipient's Spam folder.
The solution: You need to add a new field in the Notification messages
headers:
Precedence: bulk
Reference: RFC3834, http://tools.ietf.org/search/rfc3834
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