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.

- "Receipt from {local vendor 1}"

- "Receipt from {local vendor 2}"