Mail Transfer Agent, Mac OS X Server | Apple 10.6 specs

The following image gives an overview of how the components of Mac OS X Server Mail service interact:

Mac OS X Server

Mail Transfer Agent (MTA)

SMTP Server (Postfix)

External Mail

Transfer Agent (MTA)

Native Mail

User Agent (MUA)

Web Browser

Optional

Virus Scanner	Spam Filter
(ClamAV)	(Spam Assassin)

Mail Delivery Agent		Message storage
		Message storage
		on disk in
		on disk in
		Maildir format

		Dovecot
		POP Server
	Mail Delivery Agent	IMAP Server
	(Squirrel Mail)	IMAP Server
	(Squirrel Mail)

Mail Transfer Agent

Simple Mail Transfer Protocol (SMTP) is a protocol used to send and transfer mail. SMTP queues outgoing mail messages from the user. These messages are transferred over the Internet to their destinations, to be picked up by incoming mail protocols.

Mac OS X Server uses Postfix as its mail transfer agent (MTA). Postfix fully supports SMTP. Your mail users will set their mail application’s outgoing mail server to your Mac OS X Server running Postfix.

Postfix is easy to administer. Its basic configuration can be managed through Server Admin and therefore it does not rely on editing the configuration file.

Postfix uses multiple layers of defense to protect the server computer from intruders:

ÂÂ There is no direct path from the network to the security-sensitive local delivery tools.

ÂÂ Postfix does not trust the contents of its queue files or the contents of its IPC messages.

ÂÂ Postfix filters sender-provided information before exporting it via environment variables.

Chapter 1    Understanding Mail Service

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Apple 10.6 manual Mail Transfer Agent, Mac OS X Server

Contents

Mac OS X Server Apple Contents Mail Service Advanced Configuration Troubleshooting Mail Service Monitoring and Maintaining Mail Service Contents Preface What’s in This Guide To get the most recent onscreen help for Mac OS X Server Using Onscreen HelpTo see the most recent server help topics Getting Started Document Road Map Preface About This Guide Getting Additional Information Getting Documentation Updates Mail Service Architecture Understanding Mail Service Mac OS X Server Mail Transfer Agent Mail Screening Outgoing Mail Location Where Mail Is StoredIncoming Mail Location Local Delivery Agent Internet Message Access Protocol ImapDovecot Post Office Protocol POP User Interaction with Mail Service Mailman-Based Mailing Lists Using Mailing Lists with Mail ServiceWiki-Based Mailing Lists Mail service uses DNS like this Using Network Services with Mail Service Before You Begin Managing Mail Service Configuring DNS for Mail Service Using Mail Service ToolsTo enable MX records How User Account Settings Affect Mail Service Setup Overview Configure outgoing Mail service To start the mail configuration assistant Configure additional settings for Mail service Changing Mail Service Settings Administering Mail ServiceTo enable Mail Service for administration To change Mail service settings from the command line Viewing Mail Service Settings from the Command Line General SetupConfiguring Outgoing Mail Service Understanding Smtp Authentication To enable Smtp access Enabling Smtp AccessRequiring Smtp Authentication To relay Smtp mail through another server Relaying Smtp Mail Through Another ServerCopying Undeliverable Incoming Mail To keep a copy of undeliverable incoming mail Enabling Imap Access Configuring Incoming Mail ServiceSaving Mail Messages for Monitoring and Archival Purposes To save all messages Enabling POP Access To enable Imap accessTo enable POP access Choosing No Incoming Mail Retrieval To change the local delivery directory Restricting Smtp RelayTo restrict Smtp relay Rejecting Smtp Connections from Specific Servers Restricted Smtp Relay and Smtp Authentication Interaction Filtering Smtp Connections Rejecting Mail from Blacklisted SendersTo reject mail from blacklisted senders To filter Smtp connections Connection Control Limiting Junk Mail and Viruses To enable junk mail screening Mail Service FilteringEnabling Junk Mail Screening Bayesian Filters Training the junk mail filter with users’ help Training the Junk Mail Filter Filtering Mail by Language and Locale Training the junk mail filter without user interactionTo allow mail by language and locale Enabling Virus Screening To enable virus screening From the command line To enable Sieve supportServer-Side Mail Rules Managing Mail Quotas To enable a user’s mail quotaLimiting Incoming Message Size Enabling Mail Quotas for Users Configure Quota Violation Responses Configuring Quota WarningsTo configure quota warnings To configure quota violation responses To enable wiki-based mailing lists Setting Up a Wiki-Based Mailing ListMailing Lists About Mailman To enable mailing lists Setting Up a Mailman Mailing ListEnabling Mailing Lists To create a list Creating a Mailing List To set a list’s maximum message length Setting a List’s Maximum Message LengthCreating a Mailing List Description To create a list description To customize a welcome message Customizing the Mailing List Welcome MessageCustomizing the Mailing List Unsubscribe Message To customize the subscriber welcome message Setting Mailing List Message Bounce Options To enable list moderationEnabling a Mailing List Moderator To set bounce options To set privacy options Designating a Mailing List as PrivateAdding Subscribers To add subscribers Viewing a Server’s Mailing Lists Administering Mailing ListsTo see the lists Viewing a Mailing List’s Information To designate a list administrator Designating a List AdministratorAccessing Web-Based Administrator Options To access a list’s web-based options To designate a list moderator Designating a List ModeratorArchiving a List’s Mail To archive a list’s mail Viewing Mailing List Archives Working with Mailing List SubscribersAdding a Subscriber to a List Removing a List Subscriber To add or remove a subscriber’s posting privileges Changing Subscriber Posting PrivilegesSuspending a Subscriber To suspend a user’s subscription to a list Subscribing to a Mailing List Via Mail List Subscriber OptionsTo subscribe via mail Subscribing to a Mailing List Via Web Unsubscribing from a Mailing List Via Mail Setting and Changing Your Mailing List PasswordUnsubscribing from a Mailing List Via Web Changing Digest Mode To disable list deliveryDisabling List Mail Delivery To toggle digest mode Setting Additional Subscriber Options Where to Find More InformationTo access additional options Choosing Mime or Plain Text Digests Setting the Mail Service Log Detail Setting Mail Service Logging OptionsArchiving Mail Service Logs by Schedule To set the Mail service log detail Configuring Mail Client Applications Client-Specific Configuration for Mail Service Vacation Notices Using WebmailTo use WebMail How a user modifies their vacation notices Securing User Access to Mail Service Use this chapter to tune Mail service beyond a basic setupDesignating Authorized Mail Service Users Using Access Control Lists for Mail Service Access Using Workgroup Manager for Mail Service AccessTo enable a user’s mail access using Workgroup Manager Smtp Authentication Choosing Authentication for Mail ServiceTo enable mail access using ACLs To allow secure Smtp authentication Imap and POP AuthenticationTo allow less secure authentication To set less secure Imap and POP authentication To set secure Imap and POP authentication Configuring SSL for mail transport Securing Mail Service with SSL Configuring SSL Transport for Imap and POP Connections Configuring SSL Transport for Smtp ConnectionsTo configure SSL transport for Smtp connections To configure SSL transport for Imap and POP connections Enter a key size, and then press Return Generate a Certificate Signing Request CSR Enter s, and then press Return Following output appears Accessing Server Certificates from the Command Line Creating the Password File in the Keychain Creating a Password File from the Command Line To enable virtual hosting Mail Service Virtual HostEnabling Virtual Hosting Associating Users to the Virtual Host Adding or Removing Virtual HostsTo add or remove virtual hosts Postmaster@server.com At the prompt, enter the following command To create a Mac OS X Server-style alias Creating Additional Mail Addresses for Users To create a Postfix-style alias Setting Up Forwarding Mail Addresses for a UserTo forward a user’s mail To specify where mail is stored on the server Working with Mail Service Data StorageViewing the Location of the Mail Store Specifying the Location of the Mail Store To split the mail store Creating Additional Mail Store Locations Backing Up and Restoring Mail Messages Maximum Number of Mail Messages Per Volume Configuring Additional Mail Service Support for 8-Bit Mime Setting Up Mail Server Clustering with XsanConfiguring Mail Clustering To disable the default conversion Starting or Stopping Mail Service Use this chapter to monitor and maintain Mail serviceTo start or stop the service To reload Mail service from the command line Reloading Mail ServiceHolding Outbound Mail To hold outbound mail Creating an Administration Account Allowing Administrator Access to Mail FoldersTo create a mail administrator account Blocking Inbound Mail Connections Viewing an Overview of Mail Service Activity Monitoring Mail Service ActivityViewing Mail Service Logs To see an overview of Mail service activity Reclaiming Disk Space Used by Mail Service Log Archives To view a Mail service logViewing the Mail Connections List To view a list of connected mail users Monitoring the Outgoing Mail Queue Viewing Mail AccountsChecking the Outgoing Mail Queue Clearing Messages from the Outgoing Mail Queue Retrying Undelivered Outgoing Messages Viewing Mail Service StatisticsTo try to resend an outgoing message Computer responds with the following output Improving Performance Troubleshooting Mail Service When Mail Is Undeliverable When a Disk Is FullWhere to Find More Information Forwarding Undeliverable Incoming Mail Internet Books Appendix Service Settings D87.cert.pem Mailimapsieveproxyservers Emptyarray D87.key.pem Default ALL+RC4@STRENGTH 100 Mailpostfixsendercanonicalmaps 101 102 103 Strength 104 ALL!EXPORT+RC4@STRENGTH 105 106 Mailpostfixdisablemimeinput Processing 107 Begin Certificate 108 109 110 111 112 Options 113 Connect GET Post 114 115 116 117 118 119 120 121 TZ Mailconfig Lang 122 123 Begin RSA Private KEY 124 MAILER-DAEMON 125 Ratedelay Mailpostfixsmtprandomize Yes Addresses 126 127 128 Vacation Notification Script Basic Sort and Antijunk Mail Filter Self-Defined Forwarding129 130 Disks Index131 132 133 See also Mailman, subscribers Mailman 134