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<div class="moz-text-flowed" style="font-family: -moz-fixed;
font-size: 14px;" lang="x-unicode">Hallo zusammen, <br>
<br>
ich betreibe einen kleinen Debian-Mailserver mit Postfix und
Dovecot 2.1.7 und ca 50 IMAP-Postfächern. <br>
<br>
Das Problem ist, dass es nach dem Versenden von Mails manchmal
eine ganze Weile, bis die versendete Mail in den Ordner "Sent"
abgelegt wurde. <br>
Ein User teilte mir nun mit, dass er dabei manchmal sogar Timeouts
bekommt, seiner Beobachtung nach besonders bei Mails mit großen
Anhängen. <br>
<br>
Ich habe daraufhin in der 10-master.conf (siehe unten) mal das
process_limit auf 400 erhöht, aber dennoch: bis eine Mail unter
"Sent" abgelegt ist, vergehen bei mir (Ich verwende Thunderbird)
manchmal 5-10 Sekunden, auch bei reinen Textmails. An der
Bandbreite der Internetverbindung kann es also nicht liegen. <br>
<br>
Unter ps aux melden die beiden imap-login-Prozesse zusammen eine
Verbindungszahl von grob 40-50 TLS-Verbindungen, also nix, was den
Server in die Knie zwingen könnte, würde ich mal meinen. <br>
<br>
Könnte Dovecot bzw das System irgendwo einen Flaschenhals haben,
oder was könnte die Ursache sein? <br>
<br>
Vielen Dank vorab! <br>
<br>
Gruß, <br>
Markus <br>
</div>
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<fieldset class="mimeAttachmentHeader"><legend
class="mimeAttachmentHeaderName">10-master.conf</legend></fieldset>
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style="font-family: -moz-fixed; font-size: 14px;" lang="x-western">
<pre wrap="">#default_process_limit = 100
#default_client_limit = 1000
# Default VSZ (virtual memory size) limit for service processes. This is mainly
# intended to catch and kill processes that leak memory before they eat up
# everything.
#default_vsz_limit = 256M
# Login user is internally used by login processes. This is the most untrusted
# user in Dovecot system. It shouldn't have access to anything at all.
#default_login_user = dovenull
# Internal user is used by unprivileged processes. It should be separate from
# login user, so that login processes can't disturb other processes.
#default_internal_user = dovecot
service imap-login {
#Keine neuen Prozesse starten, wenn neue Verbindungen reinkommen...
service_count = 0
#...aber trotzdem immer so viele Prozesse wie CPU-Kerne vorhalten:
process_min_avail = 2
inet_listener imap {
#port = 143
}
inet_listener imaps {
#port = 993
#ssl = yes
}
# Number of connections to handle before starting a new process. Typically
# the only useful values are 0 (unlimited) or 1. 1 is more secure, but 0
# is faster. <doc/wiki/LoginProcess.txt>
#service_count = 1
# Number of processes to always keep waiting for more connections.
#process_min_avail = 10
# If you set service_count=0, you probably need to grow this.
#vsz_limit = $default_vsz_limit
}
service pop3-login {
service_count = 0
process_min_avail = 2
inet_listener pop3 {
#port = 110
}
inet_listener pop3s {
#port = 995
#ssl = yes
}
}
service lmtp {
unix_listener lmtp {
#mode = 0666
}
#Create inet listener only if you can't use the above UNIX socket
inet_listener lmtp {
# Avoid making LMTP visible for the entire internet
address = 127.0.0.1
port = 24
}
}
service imap {
# Most of the memory goes to mmap()ing files. You may need to increase this
# limit if you have huge mailboxes.
#vsz_limit = $default_vsz_limit
# Max. number of IMAP processes (connections)
process_limit = 400
}
service pop3 {
# Max. number of POP3 processes (connections)
#process_limit = 15
}
service auth {
# auth_socket_path points to this userdb socket by default. It's typically
# used by dovecot-lda, doveadm, possibly imap process, etc. Users that have
# full permissions to this socket are able to get a list of all usernames and
# get the results of everyone's userdb lookups.
#
# The default 0666 mode allows anyone to connect to the socket, but the
# userdb lookups will succeed only if the userdb returns an "uid" field that
# matches the caller process's UID. Also if caller's uid or gid matches the
# socket's uid or gid the lookup succeeds. Anything else causes a failure.
#
# To give the caller full permissions to lookup all users, set the mode to
# something else than 0666 and Dovecot lets the kernel enforce the
# permissions (e.g. 0777 allows everyone full permissions).
unix_listener auth-userdb {
#mode = 0666
#user =
#group =
}
# Postfix smtp-auth
unix_listener /var/spool/postfix/private/auth {
mode = 0666
}
# Auth process is run as this user.
#user = $default_internal_user
}
service auth-worker {
# Auth worker process is run as root by default, so that it can access
# /etc/shadow. If this isn't necessary, the user should be changed to
# $default_internal_user.
#user = root
}
service dict {
# If dict proxy is used, mail processes should have access to its socket.
# For example: mode=0660, group=vmail and global mail_access_groups=vmail
unix_listener dict {
#mode = 0600
#user =
#group =
}
}
</pre>
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<fieldset class="mimeAttachmentHeader"><legend
class="mimeAttachmentHeaderName">20-imap.conf</legend></fieldset>
<br>
<div class="moz-text-plain" wrap="true" graphical-quote="true"
style="font-family: -moz-fixed; font-size: 14px;" lang="x-western">
<pre wrap="">##
## IMAP specific settings
##
protocol imap {
# Maximum IMAP command line length. Some clients generate very long command
# lines with huge mailboxes, so you may need to raise this if you get
# "Too long argument" or "IMAP command line too large" errors often.
#imap_max_line_length = 64k
# Maximum number of IMAP connections allowed for a user from each IP address.
# NOTE: The username is compared case-sensitively.
#mail_max_userip_connections = 10
# Space separated list of plugins to load (default is global mail_plugins).
mail_plugins = $mail_plugins imap_quota
# IMAP logout format string:
# %i - total number of bytes read from client
# %o - total number of bytes sent to client
#imap_logout_format = bytes=%i/%o
# Override the IMAP CAPABILITY response. If the value begins with '+',
# add the given capabilities on top of the defaults (e.g. +XFOO XBAR).
#imap_capability =
# How long to wait between "OK Still here" notifications when client is
# IDLEing.
#imap_idle_notify_interval = 2 mins
# ID field names and values to send to clients. Using * as the value makes
# Dovecot use the default value. The following fields have default values
# currently: name, version, os, os-version, support-url, support-email.
#imap_id_send =
# ID fields sent by client to log. * means everything.
#imap_id_log =
# Workarounds for various client bugs:
# delay-newmail:
# Send EXISTS/RECENT new mail notifications only when replying to NOOP
# and CHECK commands. Some clients ignore them otherwise, for example OSX
# Mail (<v2.1). Outlook Express breaks more badly though, without this it
# may show user "Message no longer in server" errors. Note that OE6 still
# breaks even with this workaround if synchronization is set to
# "Headers Only".
# tb-extra-mailbox-sep:
# Thunderbird gets somehow confused with LAYOUT=fs (mbox and dbox) and
# adds extra '/' suffixes to mailbox names. This option causes Dovecot to
# ignore the extra '/' instead of treating it as invalid mailbox name.
# tb-lsub-flags:
# Show \Noselect flags for LSUB replies with LAYOUT=fs (e.g. mbox).
# This makes Thunderbird realize they aren't selectable and show them
# greyed out, instead of only later giving "not selectable" popup error.
#
# The list is space-separated.
#imap_client_workarounds =
}
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