[rgrove]

The "fix" for this is actually pretty trivial, and it doesn't require using a unique subject or sender.

When you send an email that you don't want to be collapsed into any previous thread on Gmail, include an `X-Entity-Ref-ID` header with a random value.

I don't remember where I learned this. I can't seem to find any official documentation mentioning it. But it works.

[quantumhobbit]

If the company can’t figure out how to add a date to the subject line, they won’t be able to figure this out either.

It’s gmails bug, but I’m amazed they couldn’t figure out hiw to implement the fix. Amazed but not too surprised given how not nimble big companies are.

[user5994461]

To be fair, the header should be significantly easier to implement. There is a truckload of issues with formatting a date in 100 languages that don't apply.

Incredible how Hacker News figured out the workaround in 6 hours, when they couldn't in 6 years.

[rgrove]

It's not a bug.

[bluetech]

We've been using it for some time as well, not even with a random value, just `X-Entity-Ref-ID: null` works too. Found it through some obscure StackOverflow answer.

[davewasthere]

Or changing the sender's email address.

e.g. [e-mail]

Otherwise a unique subject is always easy for some people.