Dear Dovecot devs,

is streaming multiple MOVE commands by clients allowed?

I am getting duplicated messages with the GNUS mail client, the interchange looks like this:

*stream two moves to different folders*

9019 UID MOVE 4062,4066,4068 "folder0" 9020 UID MOVE 4063:4064,4067,4069:4072 "folder1" *the messages are copied*

• OK [COPYUID 1424475218 4062,4066,4068 376:378] Moved UIDs.
• OK [COPYUID 1424475231 4063:4064,4067,4069:4072 26:32] Moved UIDs. *however expunge fails to clean 4063, 4064, and 4067*
• VANISHED 4062,4066,4068:4072

thus 4063, 4064, and 4067 end both in inbox and folder1 producing duplicate messages (more details at [1]).

At the GNUS mailing list, we were wondering about what should be the correct reading of RFC6851.

Version and config information below.

Best regards, Emilio

[1] More details in the thread http://permalink.gmane.org/gmane.emacs.gnus.general/86813

[2] Version $ /usr/sbin/dovecot --version 2.2.13

[3] Config

$ /usr/sbin/dovecot -n # 2.2.13: /etc/dovecot/dovecot.conf # OS: Linux 3.2.0-4-amd64 x86_64 Debian 8.3 ext4 mail_location = maildir:/home/%u/Maildir managesieve_notify_capability = mailto

managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave

namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = } passdb { driver = pam } plugin { sieve = ~/.dovecot.sieve sieve_dir = ~/sieve } protocols = " imap sieve" ssl_cert = ... ssl_key = ... userdb { driver = passwd }