Setting to disable webserver calendar invite replies (for synced appointments)

I am using Outlook as my mail client, because I am integrating with a lot of corporate contacts.

Outlook already directly sends replies via email in response to calendar invites, when you make your choice inside the desktop software. If accepted, the calendar appointment is in my case then synced from Outlook to Mailbox using CalDav Synchronizer.

My contacts are getting SICK of the automatic secondary notifications from the Mailbox webservice again confirming the invite response, in a format that is not recognized by Outlook. I didn't even initiate the invite response through the Mailbox web-interface. It is auto-confirming invites being synced by CalDav Synchronizer.

Please implement a Mailbox setting where desktop software users can disable these automatic Mailbox calendar invite responses (positive of negative), when the response is not initiated through the web-interface. I just want to sync my data to the cloud, not have Mailbox send all kinds of emails in my name that I did not initiate.

I am currently looking at alternatives to Mailbox because my contacts are getting so annoyed with all the unnecessary spam from Mailbox.