I have a service sending out automated emails via Amazon SES with some questions to answer when people sign up, and currently all replies are being grouped into a single conversation in Google Inbox. Is there some way I can tell Google that these are separate conversations?
I will give you as an answer the obvious one that applies for all e-mails from/to same sender/receiver that you do not want to be displayed as a thread (conversation) and you want each one of them to be displayed individually (in case you have not already set it up):
Open Gmail page > Click at the Gear icon > Settings > Conversation View > Set it to "Off"
I just got an programmatically answer:
I guess this link will help you.
Each eMail has in its header an id. So answers always belong to an id which can be found in eMails header.
So you have to send mails with different ids in their headers.