Emails are grouped if each message meets the following:
- The same recipients, senders, or subject as a previous message
- A reference header with the same IDs as a previous message
- Sent within one week of a previous message
https://support.google.com/mail/answer/5900?hl=en&co=GENIE.P...
The recipient is the same (me@domain.com)
The sender is the same (messenger@messaging.squareup.com)
But subject differs depending on vendor. I could get emails from square with these subject lines:
- “Receipt from {vendor1}”
- “Receipt from {vendor2}”
- “Receipt from {vendor3}”
Which does lead me to suspect it’s a header as the Google docs indicate. But the headers in each message are different.
I compared the messages to a group email convo I created between ‘me@domain.com’ and ‘me@gmail.com’ to compare and couldn’t find any similar header. There was a “in reply to” header but that same header was not found in square emails
> Sent within one week of a previous message
I have gone 1-2 weeks without interacting with a square enabled vendor in the past, so I don’t think this it.