By Peer Hartleben, Peer Heinlein
IMAP (the web Message entry Protocol) permits consumers to entry their e mail on a distant server, no matter if from the workplace, a distant place, or a cellphone 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 customer and server.
The publication of IMAP deals an in depth creation to IMAP and POP3, the 2 protocols that govern all sleek mail servers and consumers. You'll find out how the protocols paintings in addition to how you can set up, configure, and keep the 2 most well liked open resource mail structures, Courier and Cyrus.
Authors Peer Heinlein and Peer Hartleben have arrange 1000's of mail servers and provide sensible tricks approximately troubleshooting mistakes, migration, filesystem tuning, cluster setups, and password safety that can assist you extricate your self from every kind of tough occasions. You'll additionally learn the way to:
Create and use shared folders, digital domain names, and consumer quotas Authenticate consumer information with PAM, MySQL, PostgreSQL, and LDAP deal with heavy site visitors with load balancers and proxies Use integrated instruments for server research, upkeep, and upkeep 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 ebook, making The e-book of IMAP a necessary source for even the main skilled approach administrators.
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Extra info for The Book of IMAP - Building a Mail Server with Courier and Cyrus
Instead, the kernel should only use the actual IP address of the outgoing interface Ø ¼. arp_announce = 2 During setup you load these parameters manually; later on, they are activated automatically during booting. arp_announce = 2 Debian users use the command » Ø » Ò Øº »ÔÖÓ Ô×º× ×Ø ÖØ instead. Now, multiple servers have the same IP, but none of them reply to ARP requests. This means that this IP is not available—at least until we introduce the LVS load balancer. Now enter the production IP in your load balancer; this time, enter it on Ø ¼ or as an additional IP on Ø ¼ ½.
In this method, the data can be written to the journal and the user data area in any order. In principle, this method provides as much data safety as ÓÙÖÒ Ð; however, it is possible that deleted data reappears in the filesystem after a crash. You could say that this is an anomaly that is the opposite of data loss. However, this should not be a problem on a maildir system with Courier; the worst-case scenario is that some old emails reappear. Ø option when the partiThe method is specified by the corresponding tion is mounted or the entry is made in the » Ø » ×Ø .
You can use the Ì À command to specify exactly which emails (the following example specifies messages with sequence numbers from 1 to 3)7 and which parts of these emails should be transmitted. de>")) 7 If you wish to specify unique IDs instead of sequence numbers, you would use the Ì À command (see page 313). de>")) a5 OK FETCH completed. de> X-Length: 1519 Status: R X-Status: NC X-UID: 0 Hello! I am a test message. de Obligatory information according to =A735a HGB (German Commercial Code) HRB 93818 B / Berlin Charlottenburg Local Court,=20 Managing Director: Peer Heinlein =A0-- Registered Office: Berlin ) a6 OK FETCH completed.