[MlMt] Send drafts stay in draft folder

[Bill Cole]

On 2026-10-13 at 09:50:40 UTC-0400 (Tue, 13 Oct 2026 15:50:40 +0200)
Robert M. Münch <mailmate at lists.freron.com>
is rumored to have said:

> Yes, that's for MM drafts, but not any created by others. I really 
> don't understand why there is a difference in how they're handled.

It's because there's no standard for how Drafts are structured and every 
user agent does it their own way.

When MM finds some other client's draft, there is an implicit 
concurrency/race risk: the other client may consider the message to be 
"open" for editing, MM has no way to know that, and deleting the "open" 
draft may confuse the other client or it may not be noticed.

Because of this gap in the IMAP protocol, the best practice for any MUA 
is for it to never delete another client's drafts from the Drafts 
folder. Doing otherwise risks losing or duplicating messages.


-- 
  Bill Cole
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