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If mail still won t work, don t worry SMTP isn t always easy to set up If you still have problems, walk logically through all of the steps, and look for errors The first step is to look at your log messages, which might show that other mail servers are not responding If everything seems fine there, check your Domain Name System (DNS) settings Can the mail server perform name lookups Can it perform Mail Exchanger (MX) lookups Can other people perform name lookups for your mail server It is also possible that e-mails are actually being delivered but are being marked as junk or spam at the recipient end Check the junk or spam mail folder at the receiver s end Proper troubleshooting techniques are indispensable for good system administration A good resource for troubleshooting is to look at what others have done to fix similar problems Check the Postfix web site at wwwpostfixorg, or check the newsgroups at wwwgooglecom for the problems or symptoms of what you might be seeing

boolean offerFirst(E obj)

boolean offerLast(E obj) E peekFirst( ) E peekLast( ) E pollFirst( ) E pollLast( ) E pop( ) void push(E obj ) E removeFirst( )

In this chapter, we learned the basics of how SMTP works We also installed and learned how to configure a basic Postfix mail server With this information, you have enough knowledge to set up and run a production mail server If you re looking for additional information on Postfix, start with the online documentation at wwwpostfixorg The documentation is well written and easy to follow There is a wealth of information on how Postfix can be extended to perform a number of additional functions that are outside the scope of this chapter Another excellent reference on the Postfix system is The Book of Postfix: State-of-the-Art Message Transport by Ralf Hildebrandt and Patrick Koetter (No Starch Press, 2005) This book covers the Postfix system in excellent detail As with any other service, don t forget to keep up on the latest news on Postfix Security updates do come out from time to time, and it is important that you update your mail server to reflect these changes

boolean removeFirstOccurrence(Object obj) E removeLast( )

boolean removeLastOccurrence(Object obj)

n 19, we covered the differences between mail transport agents (MTAs), mail delivery agents (MDAs), and mail user agents (MUAs) When it comes to the delivery of mail to specific user mailboxes, we assumed the use of Procmail, which delivers copies of e-mail to users in the mbox format The mbox format is a simple text format that can be read by a number of console mail user agents, like pine, elm, and mutt, as well as some GUI-based mail clients The key to the mbox format, however, is that the client has direct access to the mbox file itself This works well enough in tightly administered environments where the administrator of the mail server is also the administrator of the client hosts; however, this system of mail folder administration might not scale well in certain scenarios Sample scenarios that might prove to be a bit thorny are Users inability to stay reasonably connected to a fast/secure network for file system access to their mbox file (eg, roaming laptops) Users demand local copies of e-mail for offline viewing Security requirements dictate that users not have direct access to the mail store (eg, Network File System [NFS]-shared mail spool directories are considered unacceptable) Mail user agents do not support the mbox file format (typical of Windows-based clients)

TABLE 17-6

When you drop in the SOUND block on the beam, you are given access to the configuration panel shown in Figure 6-1.