By Peer Hartleben, Peer Heinlein
IMAP (the net Message entry Protocol) permits consumers to entry their e mail on a distant server, even if from the place of work, a distant position, or a mobile phone or different gadget. IMAP is robust and versatile, yet it's additionally complex to establish; it's more challenging to enforce than POP3 and extra error-prone for either buyer and server.
The e-book of IMAP bargains a close creation to IMAP and POP3, the 2 protocols that govern all glossy mail servers and consumers. You'll learn the way the protocols paintings in addition to tips to set up, configure, and keep the 2 preferred open resource mail structures, Courier and Cyrus.
Authors Peer Heinlein and Peer Hartleben have manage countless numbers of mail servers and provide useful tricks approximately troubleshooting mistakes, migration, filesystem tuning, cluster setups, and password protection that can assist you extricate your self from every type of tough events. You'll additionally learn the way to:
Create and use shared folders, digital domain names, and consumer quotas Authenticate person facts with PAM, MySQL, PostgreSQL, and LDAP deal with heavy site visitors with load balancers and proxies Use integrated instruments for server research, upkeep, and maintenance enforce complementary webmail consumers like Squirrelmail and Horde/IMP organize and use the Sieve e mail filter
Thoroughly commented references to the POP and IMAP protocols around out the e-book, making The publication of IMAP a necessary source for even the main skilled process administrators.
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Additional info for The Book of IMAP - Building a Mail Server with Courier and Cyrus
As every user is directed to his or her “own” server, no shared file area is required. This means that no load distribution among different servers is needed if this solution is used. In very large environments, it may make sense to combine IMAP proxies and the load balancing technique: The proxy assigns connections to balancers on the basis of the user ID, and each balancer distributes its share of the connections to multiple IMAP servers. It is then possible to construct separate mail stores if an individual storage system is overloaded.
To do this, mount the data partition with the option ÒÓ Ø Ñ , and/or enter this option in the » Ø » ×Ø . The Linux kernel will no longer change the 57 4 Selecting a Filesystem Ø Ñ when read accesses occur. 2 Access Control Lists For access to an individual file, the Unix filesystem differentiates users into fixed classes: the owner of the file, users belonging to the same group as the file owner, and all other users (other/world). Access control lists (ACLs) have been added to improve flexibility.
If that is the case, the owner of the directory sees the message as read if other users have already accessed it. In contrast, Cyrus saves flags based on users. If a user changes the Ë Ò flag on a message, this will not affect the message status for other users of the same folder. Û The user has write permissions and may set flags and so on. Û does not permit the user to delete emails. The user may add and delete messages. 4 on page 237) or if the messages are moved automatically using filter scripts (see page 240).
The Book of IMAP - Building a Mail Server with Courier and Cyrus by Peer Hartleben, Peer Heinlein