I think this is related to MessageSend.jsm, not nttp-js, and it's a windows only problem. The code is at https://searchfox.org/comm-central/rev/44aa77c6da7c13b659667b96eb3c149e2096d0f1/mailnews/compose/src/MessageSend.jsm#1012. I have seen it reported elsewhere but never managed to reproduce it. Can you also reproduce when sending/saving a message with imap/pop3 account? What if you try to delete it manually by `IOUtils.remove()` or delete it from File Manager? I'm trying to understand if it's because the file handler is not released after sending.
Bug 1751461 Comment 1 Edit History
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I think this is related to MessageSend.jsm, not nntp-js, and it's a windows only problem. The code is at https://searchfox.org/comm-central/rev/44aa77c6da7c13b659667b96eb3c149e2096d0f1/mailnews/compose/src/MessageSend.jsm#1012. I have seen it reported elsewhere but never managed to reproduce it. Can you also reproduce when sending/saving a message with imap/pop3 account? What if you try to delete it manually by `IOUtils.remove()` or delete it from File Manager? I'm trying to understand if it's because the file handler is not released after sending.