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by munk-a
1734 days ago
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Email has never had explicit threading - email has a bunch of usage habits that many clients interpret as attempted threading (which often results in threads of steam receipts in my gmail webview FYI). There are a number of clients that are particularly good at respecting the specific approaches to threading used by mailing lists and that come with a plethora of powerful keyboard interactions to make browsing a whole bunch of emails trivial. But newer devs may be quite unfamiliar with those options and I don't think it's particularly easy information to learn... especially if your webmail has "just worked" for most other uses. |
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The "In-Reply-To" header is described in rfc2822. It is an explicit header in the RFC that is how you create threads.
Every mail client I've used correctly understands how to thread reply-chains using In-Reply-To.
The thing you're talking about, steam receipts grouping, is not a feature of email, but a specific feature of gmail's web view which is not mandated by any RFC and indeed is not explicit threading...
But there is a real way to thread which is defined in the RFC, and if you use a reasonable email client (aka not gmail), every mailing list's threading will work for you.