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Once upon a time, e-mail often traveled over only one SMTP hop between the mainframe on which it was composed to the machine on whose disk the recipient s in-box was stored These days, messages often travel through a half-dozen servers or more before reaching their destination This means that the SMTP envelope recipient, described in the last section, repeatedly changes as the message nears its destination An example should make this clear Several of the following details are fictitious, but they should give you a good idea of how messages actually traverse the Internet Imagine a worker in the central IT organization at Georgia Tech who tells his friend that his e-mail address is brandon@gatechedu When the friend later sends him a message, the friend s e-mail provider will look up the domain gatech.

Note The multicollection QMultiMap and QMultiHash classes are just wrappers of the QMap and QHash

var apiKey = "{{Key:key;http://api.technorati.com/}}";

edu in the Domain Name Service (DNS; see 4), receive a series of MX records in reply, and connect to one of those IP address to deliver the message Simple enough, right But the server for gatechedu serves an entire campus! To find out where brandon is, it consults a table, finds his department, and learns that his official e-mail address is actually: brandonrhodes@oitgatechedu So the gatechedu server in turn does a DNS lookup of oitgatechedu and then uses SMTP the message s second SMTP hop, if you are counting to send the message to the e-mail server for OIT, the Office of Information Technology But OIT long ago abandoned their single-server solution that used to keep all of their mail on a single Unix server Instead, they now run a sophisticated e-mail solution that users can access through webmail, POP, and IMAP.

classes. The QMap and QHash classes can be used as multicollections by using the insertMulti method, but it is easy to overwrite a list of items by accident by using the [] operator or insert method. Using the multicollections detects any such mistakes at compile-time and reduces the risk of hard-to-find bugs.

Incoming mail arriving at oitgatechedu is first sent randomly to one of several spam-filtering servers (third hop), say, the server named spam3oitgatechedu Then it is handed off randomly to one of eight redundant e-mail servers, and so after the fourth hop, the message is in the queue on mail7oitgatechedu We are almost done: the routing servers like mail7 are the ones with access to the lookup tables of which back-end mailstores, connected to large RAID arrays, hold which users So mail7 does an LDAP lookup for brandonrhodes, concludes that his mail lives on the anviloitgatechedu server, and in a fifth and final SMTP hop, the mail is delivered to anvil and there is written to the redundant disk array.

Listing 1-26 shows how a QMultiMap is created and populated. This code does not contain any surprises. However, the relationship of QMultiMap with QMap shows that if you have a look at the list returned from the keys method, foo appears twice. The best way to find all the unique keys is to add all keys to a QSet and then iterate over it. Listing 1-27 shows how to first find all keys and then iterate over them, showing all items for each key. Listing 1-26. Creating and populating a QMultiMap QMultiMap<QString, int> multi; multi.insert( "foo", 10 ); multi.insert( "foo", 20 ); multi.insert( "bar", 30 ); Listing 1-27. Finding the unique keys and then iterating over each key and its associated items QSet<QString> keys = QSet<QString>::fromList(multi.keys());

That is why e-mail often takes at least a few seconds to traverse the Internet: large organizations and big ISPs tend to have several levels of servers that a message must negotiate before its delivery How can you find out what an e-mail s route was It was emphasized previously that the SMTP protocol does not look inside e-mail headers, but has its own idea about where a message should be going that, as we have just seen, can change with every hop that a message makes toward its destination But it turns out that e-mail servers are encouraged to write new headers, precisely to keep track of a message s circuitous route from its original to its destination These headers are called Received headers, and they are a gold mine for confused system administrators trying to debug problems with their mail systems.

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