If I have an ad running on kijiji, and I get two responses in the same day, they are considered a single conversation, and I have to split them apart.
On occasion I send out an email newsletter using mailchimp. ALL the responses to it are glommed into a single conversation.
I just did a test from another account, sending the same message -- same subject, twice 1 minute apart. They ended up in separate threads. So identical subject line in a short period of time isn't sufficient, yet the kijiji replies are distinct messages.
The next are ideas that I don't know how to test.
If I use the address+string feature, are messages to different strings considered the same thread? E.g If my normal gmail address is j.random.user@gmail.com and I add (How?) a
Reply-To: j.random.user+0037
to the headers will gmail consider them to be separate threads from the original?
- Same idea, but modify the From: header instead.