Список фолдеров
mailboxes = \
  imaps://lsv@imap.altlinux.org/INBOX \
  imaps://lsv@imap.altlinux.org/lists/altdevel \
  imaps://lsv@imap.altlinux.org/lists/alt-devel \
  imaps://lsv@imap.altlinux.org/lists/alt-sisyphus \
  imaps://lsv@imap.altlinux.org/bugz/alt \
  imaps://lsv@imap.altlinux.org/git-alt \
  imaps://lsv@imap.altlinux.org/lists/alt-gnome \
  imaps://lsv@imap.altlinux.org/lists/alt-office \
  imaps://lsv@imap.altlinux.org/lists/alt-platform50-dev \
  imaps://lsv@imap.altlinux.org/lists/fedora-directory-users \
  imaps://lsv@imap.altlinux.org/lists/openldap-bugs \
  imaps://lsv@imap.altlinux.org/lists/openldap-commit \
  imaps://lsv@imap.altlinux.org/lists/openldap-devel \
  imaps://lsv@imap.altlinux.org/lists/openldap-software \
  imaps://lsv@imap.altlinux.org/lists/openldap-technical \

Вот как это в mutt'е
 0 imaps://lebedev.v.sergey@imap.gmail.com/office_server
 1 imaps://lsv@imap.altlinux.org/INBOX
 0 imaps://lsv@imap.altlinux.org/lists/altdevel
 0 imaps://lsv@imap.altlinux.org/lists/alt-devel
 0 imaps://lsv@imap.altlinux.org/lists/alt-sisyphus
 0 imaps://lsv@imap.altlinux.org/bugz/alt
 47 imaps://lsv@imap.altlinux.org/git-alt
 0 imaps://lsv@imap.altlinux.org/lists/alt-gnome
 0 imaps://lsv@imap.altlinux.org/lists/alt-office
 0 imaps://lsv@imap.altlinux.org/lists/alt-platform50-dev
 0 imaps://lsv@imap.altlinux.org/lists/fedora-directory-users
 0 imaps://lsv@imap.altlinux.org/lists/openldap-bugs
 0 imaps://lsv@imap.altlinux.org/lists/openldap-commit
 0 imaps://lsv@imap.altlinux.org/lists/openldap-devel
 0 imaps://lsv@imap.altlinux.org/lists/openldap-software
 0 imaps://lsv@imap.altlinux.org/lists/openldap-technical

Собрал mutt из raorn.git с --enable-debug

Получаю в .muttdebug0 вот такие сообщения

4> a0005 STATUS "INBOX" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0006 STATUS "lists.altdevel" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0007 STATUS "lists.alt-devel" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0008 STATUS "lists.alt-sisyphus" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0009 STATUS "bugz.alt" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0010 STATUS "git-alt" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0011 STATUS "lists.alt-gnome" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0012 STATUS "lists.alt-office" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0013 STATUS "lists.alt-platform50-dev" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0014 STATUS "lists.fedora-directory-users" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0015 STATUS "lists.openldap-bugs" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0016 STATUS "lists.openldap-commit" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0017 STATUS "lists.openldap-devel" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0018 STATUS "lists.openldap-software" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
a0019 STATUS "lists.openldap-technical" (UIDNEXT UIDVALIDITY UNSEEN RECENT)^M
4< * STATUS "INBOX" (RECENT 1 UIDNEXT 312 UIDVALIDITY 1243532042 UNSEEN 1)
INBOX (UIDVALIDITY: 1243532042, UIDNEXT: 312) 0 messages, 1 recent, 1 unseen
Running default STATUS handler
Found INBOX in buffy list (OV: 1243532042 ON: 311 U: 1)
4< a0005 OK Status completed.
4< * STATUS "lists.altdevel" (RECENT 33 UIDNEXT 209 UIDVALIDITY 1243719832 UNSEEN 33)
lists.altdevel (UIDVALIDITY: 1243719832, UIDNEXT: 209) 0 messages, 33 recent, 33 unseen
Running default STATUS handler
Found lists.altdevel in buffy list (OV: 0 ON: 0 U: 33)
4< a0006 OK Status completed.
4< * STATUS "lists.alt-devel" (RECENT 9 UIDNEXT 218 UIDVALIDITY 1243719832 UNSEEN 33)
mboxcache: hcache uidvalidity 1243719832, uidnext 209
lists.alt-devel (UIDVALIDITY: 1243719832, UIDNEXT: 218) 0 messages, 9 recent, 33 unseen
Running default STATUS handler
Found lists.alt-devel in buffy list (OV: 1243719832 ON: 209 U: 33)
4< a0007 OK Status completed.
4< * STATUS "lists.alt-sisyphus" (RECENT 0 UIDNEXT 23 UIDVALIDITY 1243992361 UNSEEN 0)
mboxcache: hcache uidvalidity 1243992361, uidnext 23
lists.alt-sisyphus (UIDVALIDITY: 1243992361, UIDNEXT: 23) 0 messages, 0 recent, 0 unseen
Running default STATUS handler
Found lists.alt-sisyphus in buffy list (OV: 1243992361 ON: 23 U: 0)
4< a0008 OK Status completed.
4< * STATUS "bugz.alt" (RECENT 30 UIDNEXT 101 UIDVALIDITY 1243719745 UNSEEN 78)
mboxcache: hcache uidvalidity 1243719745, uidnext 71
bugz.alt (UIDVALIDITY: 1243719745, UIDNEXT: 101) 0 messages, 30 recent, 78 unseen
Running default STATUS handler
Found bugz.alt in buffy list (OV: 1243719745 ON: 71 U: 78)
4< a0009 OK Status completed.
4< * STATUS "git-alt" (RECENT 47 UIDNEXT 188 UIDVALIDITY 1243867650 UNSEEN 47)
mboxcache: hcache uidvalidity 1243867650, uidnext 141
git-alt (UIDVALIDITY: 1243867650, UIDNEXT: 188) 0 messages, 47 recent, 47 unseen
Running default STATUS handler
Found git-alt in buffy list (OV: 1243867650 ON: 141 U: 47)
4< * STATUS "lists.alt-gnome" (RECENT 4 UIDNEXT 18 UIDVALIDITY 1243614063 UNSEEN 17)
mboxcache: hcache uidvalidity 1243614063, uidnext 14
lists.alt-gnome (UIDVALIDITY: 1243614063, UIDNEXT: 18) 0 messages, 4 recent, 17 unseen
Running default STATUS handler
Found lists.alt-gnome in buffy list (OV: 1243614063 ON: 14 U: 17)
4< a0011 OK Status completed.
4< * STATUS "lists.alt-office" (RECENT 5 UIDNEXT 11 UIDVALIDITY 1243891763 UNSEEN 5)
mboxcache: hcache uidvalidity 1243891763, uidnext 6
lists.alt-office (UIDVALIDITY: 1243891763, UIDNEXT: 11) 0 messages, 5 recent, 5 unseen
Running default STATUS handler
Found lists.alt-office in buffy list (OV: 1243891763 ON: 6 U: 5)
4< a0012 OK Status completed.
4< * STATUS "lists.alt-platform50-dev" (RECENT 10 UIDNEXT 41 UIDVALIDITY 1243719813 UNSEEN 10)
mboxcache: hcache uidvalidity 1243719813, uidnext 31
lists.alt-platform50-dev (UIDVALIDITY: 1243719813, UIDNEXT: 41) 0 messages, 10 recent, 10 unseen
Running default STATUS handler
Found lists.alt-platform50-dev in buffy list (OV: 1243719813 ON: 31 U: 10)
4< a0013 OK Status completed.
4< * STATUS "lists.fedora-directory-users" (RECENT 9 UIDNEXT 12 UIDVALIDITY 1243896637 UNSEEN 9)
mboxcache: hcache uidvalidity 1243896637, uidnext 3
lists.fedora-directory-users (UIDVALIDITY: 1243896637, UIDNEXT: 12) 0 messages, 9 recent, 9 unseen
Running default STATUS handler
Found lists.fedora-directory-users in buffy list (OV: 1243896637 ON: 3 U: 9)
4< a0014 OK Status completed.
ну и так далее...

На той стороне imap.altlinux.org (dovecot)