Re: Bug: Dovecot appending "MISSING_DOMAIN" to fetch envelope responses

31 Aug 2020 · *REDACTED*


      Any word about this issue? Should I file a bug in an actual bug tracker
or something?
//Mike
On Sat, 15 Aug, 2020 at 13:26, Michael Gratton mike@vee.net wrote:
...
Hi all,
I'm seeing Dovecot include the string "MISSING_DOMAIN" in fetch
envelope requests when an mailbox's addr-spec part does not have a
domain part.
For example:
...
C: a022 uid fetch 40 (envelope rfc822.header)
S: * 5 FETCH (UID 40 ENVELOPE ("Sat, 15 Aug 2020 12:53:05 +1000"
"test {{name}}" (("Michael Gratton" NIL "mike" "vee.net"))
(("Michael Gratton" NIL "mike" "vee.net")) (("Michael Gratton" NIL
"mike" "vee.net")) (("postgres" NIL "postgres" "MISSING_DOMAIN"))
NIL NIL NIL NIL) RFC822.HEADER {literal/244b})
I understand that RFC 5322 require a mailbox to have a domain part,
however it is still possible for mail to contain mailboxes that do
not. In these cases, Dovecot returning random string such as the
above is harmful, since it not possible for IMAP clients to determine
whether host name string is actually present or something that the
IMAP server has made up.
As a result, an IMAP client has two options: Either display the
string as-is, preventing it from providing an appropriately localised
explanation or visual indication of the problem in the user
interface, or simply avoid ever requesting IMAP envelopes from the
server and always download and parse the complete RFC822 headers
itself (as I believe Thunderbird does).
The former is untenable since "MISSING_DOMAIN" does not mean anything
to non-English speakers, the latter is untenable since it
unnecessarily inflates the of volume of data that must be transmitted
over the wire to work around a server bug.
In these cases, or when any other part of a required IMAP address
structure is missing, Dovecot should return the empty string, e.g. "".
Cheers,
//Mike
Dovecot details:
...
*REDACTED*:~$ sudo dovecot -n
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.4 ()
# OS: Linux 4.19.0-9-amd64 x86_64 Debian 10.4 ext4
# Hostname: *REDACTED*
first_valid_uid = *REDACTED*
hostname = *REDACTED*
last_valid_uid = *REDACTED*
lda_original_recipient_header = X-Original-To
lmtp_rcpt_check_quota = yes
lmtp_save_to_detail_mailbox = yes
mail_gid = *REDACTED*
mail_home = *REDACTED*
mail_location = mdbox:*REDACTED*:UTF-8
mail_privileged_group = mail
mail_server_admin = mailto:*REDACTED*
mail_temp_dir = *REDACTED*
mail_uid = *REDACTED*
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 index ihave duplicate mime foreverypart
extracttext imapsieve vnd.dovecot.imapsieve
namespace inbox {
inbox = yes
location =
mailbox Drafts {
auto = subscribe
special_use = \Drafts
}
mailbox Junk {
auto = subscribe
autoexpunge = 30 days
special_use = \Junk
}
mailbox Sent {
auto = subscribe
special_use = \Sent
}
mailbox Trash {
auto = subscribe
autoexpunge = 30 days
special_use = \Trash
}
prefix =
separator = .
type = private
}
passdb {
args = *REDACTED*
driver = ldap
}
plugin {
imapsieve_mailbox1_before = file:*REDACTED*
imapsieve_mailbox1_causes = COPY
imapsieve_mailbox1_name = Junk
imapsieve_mailbox2_before = file:*REDACTED*
imapsieve_mailbox2_causes = COPY
imapsieve_mailbox2_from = Junk
imapsieve_mailbox2_name = *
recipient_delimiter = +
sieve = file://*REDACTED*
sieve_before = /etc/dovecot/sieve-before.d
sieve_global_extensions = +vnd.dovecot.pipe
+vnd.dovecot.environment +vnd.dovecot.report
sieve_pipe_bin_dir = /etc/dovecot/sieve-scripts
sieve_plugins = sieve_imapsieve sieve_extprograms
sieve_quota_max_storage = 50M
}
postmaster_address = *REDACTED*
protocols = " imap lmtp sieve"
service auth-worker {
user = mail
}
service auth {
unix_listener *REDACTED* {
group = postfix
mode = 0666
user = postfix
}
}
service lmtp {
process_min_avail = 2
unix_listener *REDACTED* {
group = postfix
mode = 0600
user = postfix
}
user = mail
}
ssl = required
ssl_cert = <*REDACTED*
ssl_client_ca_dir = *REDACTED*
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
submission_host = *REDACTED*:587
userdb {
args = uid=8
driver = static
}
protocol lmtp {
mail_plugins = " sieve"
}
protocol imap {
mail_plugins = " imap_sieve"
}
--
Michael Gratton.
https://mjog.vee.net
--
Michael Gratton.
https://mjog.vee.net