Contents. I How To Set Up and Maintain IMAP Servers 15. Introduction 13

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1 Introduction 13 I How To Set Up and Maintain IMAP Servers 15 1 Protocols and Terms WhyIsIMAPSoComplex? ComparingCourierandCyrus POP3 and IMAP at the Protocol Level POP TestSession AuthenticationviaAPOPandKPOP IMAP TheDesignoftheIMAPProtocol TranscriptofanIMAPSession APracticalViewofIMAP SubscribingtoIMAPFolders Load Distribution and Reliability LoadBalancer DNSRoundRobin Round Robin via iptables LinuxVirtualServer IMAPProxies

2 4 Selecting a Filesystem APerformanceTest TuningthePerformanceoftheFilesystem The atime AccessControlLists The Ext2/Ext3 Option dir_index JournalMode Optimized fstab Entries RAID NFS Disabling atime andoptimizingblocksize NFSVersion FastI/O Complementary Webmail Clients Squirrelmail Horde/IMP FastAccessviatheIMAPCacheProxy Migrating IMAP servers Migration Using imapsync Convertingmboxtomaildir ModifyingFolderNames DeterminingCleartextPasswords II Courier-IMAP 83 7 Structure and Basic Configuration InstallingtheSoftware WhatIsWhere? InitialStart-Up CourierandMTAs CourierandPostfix CourierandQMail CourierandExim

3 7.5 OptimizingtheConfiguration Realand False ConfigurationParameters POP3 Configuration in /etc/courier/pop3d Configuring the IMAP Daemon in /etc/courier/ imapd TheConfigurationFilesforSSL Maildir as Storage Format TheIMAPNamespace Filenamesof s Keywords:CustomIMAPFlags User Data authtest and DEBUG_LOGIN for Debugging Assistance The authdaemond AuthenticationviaPAM The authuserdb Module Converting passwd into a userdb Maintaining Account Data with userdb Creating a Binary Version of the User Database Separating the userdb intomultiplefiles The atime Using QMail s vchkpw LibraryforAuthentication ImplementingCustomAuthenticationMethods IntegratingExternalAuthenticationPrograms AuthenticationviaMySQL AuthenticationviaPostgreSQL AuthenticationviaLDAP ObsoleteAuthenticationModules The authpwd Module The authshadow Module The authcram Module UserOptions Saving User Options in the userdb Individual User Options in an LDAP Directory

4 Storing User Options in Dedicated Fields in an SQL Table SavingPasswords:CleartextorHash? Username Selection When Maintaining Multiple Domains The Work of a Courier Administrator SharedFolders SettingUpVirtualSharedFolders CreatingFilesystem-BasedSharedFolders Quotas QuotasforCourier QuotasandtheMDA BuildinganIMAPProxywithCourier Push Instead of Pull: The IDLE Command Sending sviatheIMAPServer III Cyrus-IMAP Structure and Basic Configuration InstallingCyrus OpenSuSE/SuSE Linux Enterprise Server (SLES) FedoraCore/RedHat Debian TheCyrusHierarchyandPermissionsSystem FeaturesandFunctions QuickStart AuthenticationandMailboxes Tests A Closer Look at the Configuration Files /etc/cyrus.conf The START } Section The SERVICES } Section The EVENTS } Section /etc/imapd.conf

5 13 Authentication and Safeguards EncryptingwithSSL/TLS SSLTransmissionTypes RealandFakeCertificates Creating and Integrating SSL Certificates CyrusSASL CyrusSASLModules The auxprop Module TheAuthenticationProcess CallingDifferentDataSources Standard Authentication Methods for Unix sasldb CyrusandMySQL CyrusandLDAP CyrusandKerberos Advanced Cyrus Configuration MailboxQuotas AutomaticQuotas ManualQuotas SharedFoldersandACLs VirtualDomains TheUnderlyingConcept EffectsonACLs DomainAdministrators Sorting sintoSubdirectories Partitions TheSieve Filter The Filter Daemon timsieved ConfiguringandTesting The sieveshell AdministrationTool TheSieveScriptLanguage Setting Up Sieve Scripts Automatically for New Accounts AdaptingSieveScripts

6 14.7 The notifyd Daemon DrumsorSmokeSignals? CyrusandOtherMTAs BackingUpandRestoringData Using reconstruct torepairmailboxes RestoringQuotas PerformanceTuning Parameters in /etc/imapd.conf that influence performance Internal Structure and Modules TheCyrusDaemons ToolsforAnalysis,Maintenance,andRepairs StatisticsandAnalysis MaintenanceandRepair InternalTools OtherIn-HouseTools The cyradm AdministrationTool Cyrus at the Filesystem Level The Directory TheAdministrationDirectory Cyrus in a Cluster TheCyrusAggregator TheAggregatorConcept TheClusterSetup CyrusReplication ReplicatingtheAuthenticationData

7 Appendixes 293 A IMAP Command Reference 295 A.1 CommandsAlwaysAvailabletoClients A.2 CommandsAvailableintheNot-AuthenticatedStatus A.3 CommandsAvailableintheAuthenticatedStatus A.4 CommandsAvailableintheSelectedStatus A.5 IMAPExtensions A.6 ExperimentalCommands B POP3 Command Reference 317 B.1 AnOverviewofAllCommands C Installing from the Source Code 321 C.1 Courier C.2 Cyrus C.2.1 CyrusSources C.2.2 CreatingaSystemUser C.2.3 InstallingCyrusSASL C.2.4 InstallingtheCyrusIMAPServer C.2.5 ConvenientStartingandStopping