Hi all.
I've got a problem that has more or less followed me since I started using courier and more specifik courier-imap. My server only has a few domains with a totalt of around twenty users that frequently access the server for their email.
It _never_ fails for anyone to fire up their client (me and almost all of the others run Thunderbird) and log on to the server. It almost never fails to retrieve and read the email and doing maintenance such as moving emails from the inbox to another folder within the account. But after a few minutes the connection hangs - or almost hangs - and the only resolution is to restart the client (or force it to disconnect and re-connect to the imap-account).
Now, the server sits on a single 2Mbps-connection (dedicated) with hardly no traffic at all. I can't se anything that would be relevant enough to even begin to explain this behavior so now im turning to your bright minds to see if anyone can help me in finding what parameters I need to tune to get this working more smoothly.
Ive done some stats and there are never more then 5 clients logged on at the same time over a time of one hour. All clients has the setting of at least 5 minutes lean-time before re-checking if new mail has arrived (so there should be no congestion?). I've enclosed my setup below.
Id love to hear from someone about these problems. Is there anything I can change?
Regards and TIA,
Niclas
--
##VERSION: $Id: authdaemonrc.in,v 1.8 2001/10/07 02:16:22 mrsam Exp $ # # Copyright 2000-2001 Double Precision, Inc. See COPYING for # distribution information. # # authdaemonrc created from authdaemonrc.dist by sysconftool # # Do not alter lines that begin with ##, they are used when upgrading # this configuration. # # This file configures authdaemond, the resident authentication daemon. # # Comments in this file are ignored. Although this file is intended to # be sourced as a shell script, authdaemond parses it manually, so # the acceptable syntax is a bit limited. Multiline variable contents, # with the \ continuation character, are not allowed. Everything must # fit on one line. Do not use any additional whitespace for indentation, # or anything else.
##NAME: authmodulelist:0 # # The authentication modules that are linked into authdaemond. The # default list is installed. You may selectively disable modules simply # by removing them from the following list. The available modules you # can use are: authcustom authcram authuserdb authldap authmysql authpam
authmodulelist="authuserdb authpam"
##NAME: authmodulelistorig:1 # # This setting is used by Courier's webadmin module, and should be left # alone
authmodulelistorig="authcustom authcram authuserdb authldap authmysql authpam"
##NAME: daemons:0 # # The number of daemon processes that are started. authdaemon is typically # installed where authentication modules are relatively expensive: such # as authldap, or authmysql, so it's better to have a number of them running. # PLEASE NOTE: Some platforms may experience a problem if there's more than # one daemon. Specifically, SystemV derived platforms that use TLI with # socket emulation. I'm suspicious of TLI's ability to handle multiple # processes accepting connections on the same filesystem domain socket. # # You may need to increase daemons if as your system load increases. Symptoms # include sporadic authentication failures. If you start getting # authentication failures, increase daemons. However, the default of 5 # SHOULD be sufficient. Bumping up daemon count is only a short-term # solution. The permanent solution is to add more resources: RAM, faster # disks, faster CPUs...
daemons=5
##NAME: version:0 # # When you have multiple versions of authdaemond.* installed, authdaemond # just picks the first one it finds. Set "version" to override that. # For example: version=authdaemond.plain
version=""
##NAME: authdaemonvar:0 # # authdaemonvar is here, but is not used directly by authdaemond. It's # used by various configuration and build scripts, so don't touch it!
authdaemonvar=/var/run/courier/authdaemon
##VERSION: $Id: imapd.dist.in,v 1.29 2004/04/18 15:54:39 mrsam Exp $ # # imapd created from imapd.dist by sysconftool # # Do not alter lines that begin with ##, they are used when upgrading # this configuration. # # Copyright 1998 - 2004 Double Precision, Inc. See COPYING for # distribution information. # # This configuration file sets various options for the Courier-IMAP server # when used with the couriertcpd server. # A lot of the stuff here is documented in the manual page for couriertcpd. # # NOTE - do not use \ to split long variable contents on multiple lines. # This will break the default imapd.rc script, which parses this file. # ##NAME: ADDRESS:0 # # Address to listen on, can be set to a single IP address. # # ADDRESS=127.0.0.1
ADDRESS=0
##NAME: PORT:1 # # Port numbers that connections are accepted on. The default is 143, # the standard IMAP port. # # Multiple port numbers can be separated by commas. When multiple port # numbers are used it is possible to select a specific IP address for a # given port as "ip.port". For example, "127.0.0.1.900,192.68.0.1.900" # accepts connections on port 900 on IP addresses 127.0.0.1 and 192.68.0.1 # The previous ADDRESS setting is a default for ports that do not have # a specified IP address.
PORT=143
##NAME: AUTHSERVICE:0 # # It's possible to authenticate using a different 'service' parameter # depending on the connection's port. This only works with authentication # modules that use the 'service' parameter, such as PAM. Example: # # AUTHSERVICE143=imap # AUTHSERVICE993=imaps
##NAME: MAXDAEMONS:0 # # Maximum number of IMAP servers started #
MAXDAEMONS=40
##NAME: MAXPERIP:0 # # Maximum number of connections to accept from the same IP address
MAXPERIP=10
##NAME: PIDFILE:0 # # File where couriertcpd will save its process ID #
PIDFILE=/var/run/courier/imapd.pid
##NAME: TCPDOPTS:0 # # Miscellaneous couriertcpd options that shouldn't be changed. #
TCPDOPTS="-nodnslookup -noidentlookup"
##NAME: AUTHMODULES:0 # # Authentication modules. Here's the default list: # # authdaemon # # The default is set during the initial configuration. # # If this is currently set to AUTHMODULES="authdaemon", DO NOT CHANGE IT. # Instead, change the parameter authmodulelist in authdaemonrc.
AUTHMODULES="authdaemon"
##NAME: AUTHMODULES_ORIG:0 # # For use by webadmin
AUTHMODULES_ORIG="authdaemon"
##NAME: DEBUG_LOGIN:0 # # Dump additional login diagnostics to syslog # # DEBUG_LOGIN=0 - turn off login debugging # DEBUG_LOGIN=1 - turn on login debugging # DEBUG_LOGIN=2 - turn on login debugging + log passwords too # # Note that most information is sent to syslog at level 'debug', so # you may need to modify your /etc/syslog.conf to be able to see it.
DEBUG_LOGIN=1
##NAME: IMAP_CAPABILITY:1 # # IMAP_CAPABILITY specifies what most of the response should be to the # CAPABILITY command. # # If you have properly configured Courier to use CRAM-MD5 or CRAM-SHA1 # authentication (see INSTALL), set IMAP_CAPABILITY as follows: # # IMAP_CAPABILITY="IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA AUTH=CRAM-MD5 AUTH=CRAM-SHA1 IDLE" #
IMAP_CAPABILITY="IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE"
##NAME: KEYWORDS_CAPABILITY:0 # # IMAP_KEYWORDS=1 enables custom IMAP keywords. Set this option to 0 to # disable custom keywords.
IMAP_KEYWORDS=1
##NAME: SMAP1_CAPABILITY:0 # # EXPERIMENTAL # # To enable the experimental "Simple Mail Access Protocol" extensions, # uncomment the following setting. # # SMAP_CAPABILITY=SMAP1
##NAME: IMAP_CAPABILITY_ORIG:1 # # For use by webadmin
IMAP_CAPABILITY_ORIG="IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA AUTH=CRAM-MD5 AUTH=CRAM-SHA1 IDLE"
##NAME: IMAP_IDLE_TIMEOUT:0 # # This setting controls how often # the server polls for changes to the folder, in IDLE mode (in seconds).
IMAP_IDLE_TIMEOUT=60
##NAME: IMAP_CAPABILITY_TLS:0 # # The following setting will advertise SASL PLAIN authentication after # STARTTLS is established. If you want to allow SASL PLAIN authentication # with or without TLS then just comment this out, and add AUTH=PLAIN to # IMAP_CAPABILITY
IMAP_CAPABILITY_TLS="$IMAP_CAPABILITY AUTH=PLAIN"
##NAME: IMAP_TLS_ORIG:0 # # For use by webadmin
IMAP_CAPABILITY_TLS_ORIG="$IMAP_CAPABILITY_ORIG AUTH=PLAIN"
##NAME: IMAP_DISABLETHREADSORT:0 # # Set IMAP_DISABLETHREADSORT to disable the THREAD and SORT commands - # server side sorting and threading. # # Those capabilities will still be advertised, but the server will reject # them. Set this option if you want to disable all the extra load from # server-side threading and sorting. Not advertising those capabilities # will simply result in the clients reading the entire folder, and sorting # it on the client side. That will still put some load on the server. # advertising these capabilities, but rejecting the commands, will stop this # silliness. #
IMAP_DISABLETHREADSORT=0
##NAME: IMAP_CHECK_ALL_FOLDERS:0 # # Set IMAP_CHECK_ALL_FOLDERS to 1 if you want the server to check for new # mail in every folder. Not all IMAP clients use the IMAP's new mail # indicator, but some do. Normally new mail is checked only in INBOX, # because it is a comparatively time consuming operation, and it would be # a complete waste of time unless mail filters are used to deliver # mail directly to folders. # # When IMAP clients are used which support new mail indication, and when # mail filters are used to sort incoming mail into folders, setting # IMAP_CHECK_ALL_FOLDERS to 1 will allow IMAP clients to announce new # mail in folders. Note that this will result in slightly more load on the # server. #
IMAP_CHECK_ALL_FOLDERS=0
##NAME: IMAP_OBSOLETE_CLIENT:0 # # Set IMAP_OBSOLETE_CLIENT if your IMAP client expects \\NoInferiors to mean # what \\HasNoChildren really means.
IMAP_OBSOLETE_CLIENT=0
##NAME: IMAP_ULIMITD:0 # # IMAP_ULIMITD sets the maximum size of the data segment of the server # process. The value of IMAP_ULIMITD is simply passed to the "ulimit -d" # command (or ulimit -v). The argument to ulimi sets the upper limit on the # size of the data segment of the server process, in kilobytes. The default # value of 65536 sets a very generous limit of 64 megabytes, which should # be more than plenty for anyone. # # This feature is used as an additional safety check that should stop # any potential denial-of-service attacks that exploit any kind of # a memory leak to exhaust all the available memory on the server. # It is theoretically possible that obscenely huge folders will also # result in the server running out of memory when doing server-side # sorting (by my calculations you have to have at least 100,000 messages # in a single folder, for that to happen).
IMAP_ULIMITD=65536
##NAME: IMAP_USELOCKS:0 # # Setting IMAP_USELOCKS to 1 will use dot-locking to support concurrent # multiple access to the same folder. This incurs slight additional # overhead. Concurrent multiple access will still work without this setting, # however occasionally a minor race condition may result in an IMAP client # downloading the same message twice, or a keyword update will fail. # # IMAP_USELOCKS=1 is strongly recommended when shared folders are used.
IMAP_USELOCKS=1
##NAME: IMAP_SHAREDINDEXFILE:0 # # The index of all accessible folders. Do not change this setting unless # you know what you're doing. See README.sharedfolders for additional # information.
IMAP_SHAREDINDEXFILE=/etc/courier/shared/index
##NAME: IMAP_ENHANCEDIDLE:0 # # If Courier was compiled with the File Alteration Monitor, setting # IMAP_ENHANCEDIDLE to 1 enables enhanced IDLE mode, where multiple # clients may open the same folder concurrently, and receive updates to # folder contents in realtime. See the imapd(8) man page for additional # information. # # IMPORTANT: IMAP_USELOCKS *MUST* also be set to 1, and IDLE must be included # in the IMAP_CAPABILITY list. #
IMAP_ENHANCEDIDLE=0
##NAME: IMAP_TRASHFOLDERNAME:0 # # The name of the magic trash Folder. For MSOE compatibility, # you can set IMAP_TRASHFOLDERNAME="Deleted Items". # # IMPORTANT: If you change this, you must also change IMAP_EMPTYTRASH
IMAP_TRASHFOLDERNAME=Trash
##NAME: IMAP_EMPTYTRASH:0 # # The following setting is optional, and causes messages from the given # folder to be automatically deleted after the given number of days. # IMAP_EMPTYTRASH is a comma-separated list of folder:days. The default # setting, below, purges 7 day old messages from the Trash folder. # Another useful setting would be: # # IMAP_EMPTYTRASH=Trash:7,Sent:30 # # This would also delete messages from the Sent folder (presumably copies # of sent mail) after 30 days. This is a global setting that is applied to # every mail account, and is probably useful in a controlled, corporate # environment. # # Important: the purging is controlled by CTIME, not MTIME (the file time # as shown by ls). It is perfectly ordinary to see stuff in Trash that's # a year old. That's the file modification time, MTIME, that's displayed. # This is generally when the message was originally delivered to this # mailbox. Purging is controlled by a different timestamp, CTIME, which is # changed when the file is moved to the Trash folder (and at other times too). # # You might want to disable this setting in certain situations - it results # in a stat() of every file in each folder, at login and logout. #
IMAP_EMPTYTRASH=Trash:7
##NAME: IMAP_MOVE_EXPUNGE_TO_TRASH:0 # # Set IMAP_MOVE_EXPUNGE_TO_TRASH to move expunged messages to Trash. This # effectively allows an undo of message deletion by fishing the deleted # mail from trash. Trash can be manually expunged as usually, and mail # will get automatically expunged from Trash according to IMAP_EMPTYTRASH. # # NOTE: shared folders are still expunged as usual. Shared folders are # not affected. #
IMAP_MOVE_EXPUNGE_TO_TRASH=0
##NAME: OUTBOX:0 # # The next set of options deal with the "Outbox" enhancement. # Uncomment the following setting to create a special folder, named # INBOX.Outbox # # OUTBOX=.Outbox
##NAME: SENDMAIL:0 # # If OUTBOX is defined, mail can be sent via the IMAP connection by copying # a message to the INBOX.Outbox folder. For all practical matters, # INBOX.Outbox looks and behaves just like any other IMAP folder. If this # folder doesn't exist it must be created by the IMAP mail client, just # like any other IMAP folder. The kicker: any message copied or moved to # this folder is will be E-mailed by the Courier-IMAP server, by running # the SENDMAIL program. Therefore, messages copied or moved to this # folder must be well-formed RFC-2822 messages, with the recipient list # specified in the To:, Cc:, and Bcc: headers. Courier-IMAP relies on # SENDMAIL to read the recipient list from these headers (and delete the Bcc: # header) by running the command "$SENDMAIL -oi -t -f $SENDER", with the # message piped on standard input. $SENDER will be the return address # of the message, which is set by the authentication module. # # DO NOT MODIFY SENDMAIL, below, unless you know what you're doing. #
SENDMAIL=/usr/sbin/sendmail
##NAME: HEADERFROM:0 # # For administrative and oversight purposes, the return address, $SENDER # will also be saved in the X-IMAP-Sender mail header. This header gets # added to the sent E-mail (but it doesn't get saved in the copy of the # message that's saved in the folder) # # WARNING - By enabling OUTBOX above, *every* IMAP mail client will receive # the magic OUTBOX treatment. Therefore advance LARTing is in order for # _all_ of your lusers, until every one of them is aware of this. Otherwise if # OUTBOX is left at its default setting - a folder name that might be used # accidentally - some people may be in for a rude surprise. You can redefine # the name of the magic folder by changing OUTBOX, above. You should do that # and pick a less-obvious name. Perhaps brand it with your organizational # name ( OUTBOX=.WidgetsAndSonsOutbox )
HEADERFROM=X-IMAP-Sender
##NAME: IMAPDSTART:0 # # IMAPDSTART is not used directly. Rather, this is a convenient flag to # be read by your system startup script in /etc/rc.d, like this: # # . /etc/courier/imapd # # case x$IMAPDSTART in # x[yY]*) # /usr/lib/courier/imapd.rc start # ;; # esac # # The default setting is going to be NO, so you'll have to manually flip # it to yes.
IMAPDSTART=YES
##NAME: MAILDIRPATH:0 # # MAILDIRPATH - directory name of the maildir directory. # MAILDIRPATH=Maildir
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