Package: thunderbird
Version: 1:140.7.1esr-1~deb13u1

(4th attempt to submit this bug report)

Editing an e-mail for a long time leads to copies in DraftBox which do not get 
automatically removed while editing or after the e-mail is sent. For example, 
editing this very e-mail leads to the copies as in the attached screenshot.

Here's my current configuration (the sensitive parts of the local path have 
been anonymized) in 
~/.thunderbird/8_letters_and_digits.default-default/prefs.js:

user_pref("mail.identity.id8.archive_enabled", false);
user_pref("mail.identity.id8.archive_folder", 
"imap://alma0%[email protected]/Archives");
user_pref("mail.identity.id8.archives_folder_picker_mode", "0");
user_pref("mail.identity.id8.attachPgpKey", true);
user_pref("mail.identity.id8.attach_signature", false);
user_pref("mail.identity.id8.attach_vcard", false);
user_pref("mail.identity.id8.autoEncryptDrafts", true);
user_pref("mail.identity.id8.catchAll", false);
user_pref("mail.identity.id8.compose_html", false);
user_pref("mail.identity.id8.doBcc", false);
user_pref("mail.identity.id8.draft_folder", 
"imap://alma0%[email protected]/DraftBox");
user_pref("mail.identity.id8.drafts_folder_picker_mode", "1");
user_pref("mail.identity.id8.e2etechpref", 0);
user_pref("mail.identity.id8.encryptionpolicy", 0);
user_pref("mail.identity.id8.fcc_folder", 
"imap://alma0%[email protected]/SentBox");
user_pref("mail.identity.id8.fcc_folder_picker_mode", "1");
user_pref("mail.identity.id8.fullName", "Al Ma");
user_pref("mail.identity.id8.htmlSigFormat", false);
user_pref("mail.identity.id8.is_gnupg_key_id", true);
user_pref("mail.identity.id8.protectSubject", true);
user_pref("mail.identity.id8.reply_on_top", 1);
user_pref("mail.identity.id8.sendAutocryptHeaders", true);
user_pref("mail.identity.id8.sig_bottom", true);
user_pref("mail.identity.id8.sign_mail", false);
user_pref("mail.identity.id8.smtpServer", "smtp8");
user_pref("mail.identity.id8.stationery_folder", 
"imap://alma0%[email protected]/DraftBox");
user_pref("mail.identity.id8.tmpl_folder_picker_mode", "1");
user_pref("mail.identity.id8.useremail", "[email protected]");
user_pref("mail.identity.id8.valid", true);
user_pref("mail.server.server17.ageLimit", 30);
user_pref("mail.server.server17.applyToFlaggedMessages", false);
user_pref("mail.server.server17.check_new_mail", true);
user_pref("mail.server.server17.check_time", 61);
user_pref("mail.server.server17.cleanupBodies", false);
user_pref("mail.server.server17.daysToKeepBodies", 30);
user_pref("mail.server.server17.daysToKeepHdrs", 30);
user_pref("mail.server.server17.directory", 
"/home/username/.thunderbird/8_letters_and_digits.default-default/ImapMail/imap.rambler-1.ru");
user_pref("mail.server.server17.directory-rel", 
"[ProfD]ImapMail/imap.rambler-1.ru");
user_pref("mail.server.server17.downloadByDate", false);
user_pref("mail.server.server17.downloadUnreadOnly", false);
user_pref("mail.server.server17.dual_use_folders", false);
user_pref("mail.server.server17.hostname", "imap.rambler.ru");
user_pref("mail.server.server17.lastFilterTime", 29532226);
user_pref("mail.server.server17.login_at_startup", true);
user_pref("mail.server.server17.max_cached_connections", 5);
user_pref("mail.server.server17.moveOnSpam", true);
user_pref("mail.server.server17.moveTargetMode", 1);
user_pref("mail.server.server17.name", "[email protected]");
user_pref("mail.server.server17.namespace.personal", "\"\"");
user_pref("mail.server.server17.nextFilterTime", 29532236);
user_pref("mail.server.server17.numHdrsToKeep", 2000);
user_pref("mail.server.server17.port", 143);
user_pref("mail.server.server17.purgeSpam", true);
user_pref("mail.server.server17.purgeSpamInterval", 1200);
user_pref("mail.server.server17.serverIDResponse", "(\"name\" \"Dovecot\")");
user_pref("mail.server.server17.socketType", 2);
user_pref("mail.server.server17.spamActionTargetAccount", 
"imap://alma0%[email protected]");
user_pref("mail.server.server17.spamActionTargetFolder", 
"imap://alma0%[email protected]/Spam");
user_pref("mail.server.server17.storeContractID", 
"@mozilla.org/msgstore/berkeleystore;1");
user_pref("mail.server.server17.timeout", 29);
user_pref("mail.server.server17.trash_folder_name", "Trash");
user_pref("mail.server.server17.type", "imap");
user_pref("mail.server.server17.userName", "[email protected]");
user_pref("mail.server.server17.using_subscription", false);
user_pref("mail.smtpserver.smtp8.authMethod", 3);
user_pref("mail.smtpserver.smtp8.description", "[email protected]");
user_pref("mail.smtpserver.smtp8.hostname", "smtp.rambler.ru");
user_pref("mail.smtpserver.smtp8.port", 25);
user_pref("mail.smtpserver.smtp8.try_ssl", 2);
user_pref("mail.smtpserver.smtp8.type", "smtp");
user_pref("mail.smtpserver.smtp8.username", "[email protected]");
user_pref("mail.smtpserver.smtp9.authMethod", 10);

Here is what Rambler's server can do:

$ openssl s_client -connect imap.rambler.ru:993
…
a1 CAPABILITY
* CAPABILITY IMAP4rev1 UNSELECT LITERAL+ IDLE QUOTA AUTH=PLAIN
a1 OK completed

Related: http://bugs.debian.org/915570 (but the report there is not specific to 
Rambler).

The support of the e-mail provider said they could not reproduce the bug and 
suggested that it had something to do with my client's settings. I'm opposed to 
experimenting with the settings blindly; I'd like to know what the Thunderbird 
maintainers have to say on the issue first. (Of course, I could try nondefault 
workarounds, such as storing drafts locally and not on the server, but this 
would be uncomfortable for me in the long run.)

Gratefully
Alma

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