Mu 1.7.23 Causing Maildir Corruption

Title: Mu 1.7.23 Causing Maildir Corruption
Author: Matthew Smith <>
Posted: 2022-06-26
Revision: 1
News-Item-Format: 2.0
Display-If-Installed: =net-mail/mu-1.7.23

Development versions of mu between 1.7.18 and 1.7.25 (only 1.7.23 was ever
packaged in Gentoo) have a bug causing mail file names to sometimes get mangled
after moving messages between directories. Symptoms include unread messages
never being marked as read.

Affected messages have the ':2,' flag appended multiple times. Using the
following commands, users can remove the extra flags.

    find ~/Maildir -name '*:2,*:*' |
      sed "s/\(\([^:]*\)\(:2,\)\{1,\}\(:2,.*$\)\)/mv '\0' '\2\4'/" \
    # review empty file indicates that you are unaffected

Upstream issue: