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In addition to the standard SMTP commands presented here, RFC 1869 proposed extensions to SMTP called ESMTP. ESMTP allows developers to extend the services currently provided by SMTP. MTAs that support ESMTP commands will attempt to greet each other with the EHLO command. If ESMTP is supported, a list of implemented commands on the remote server is returned. For example,
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server% telnet server.companyB.com 25 Trying 192.68.232.45... Connected to server.companyB.com. Escape character is '^]'. 220 server.companyB.com ESMTP Sendmail 8.9.1a/8.9.1; Fri, 18 Feb 2000 13:05:14 +1100 (EST) EHLO server.companyA.com 250-server.companyB.com Hello pwatters@server.companyA.com [192.68.231.64], pleased to meet you 250-EXPN 250-VERB 250-8BITMIME 250-SIZE 250-DSN 250-ONEX 250-ETRN 250-XUSR 250 HELP
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One example of an ESMTP command is Delivery Status Notification (DSN), which was proposed in RFC 1891, and which reports on the status of remote mail deliveries to local users.
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Many users today do not log in directly to an interactive shell on a mail server and run a local mail client like mailx or elm instead, they are able to use a GUI-based mailreading client that runs locally on their PC, contacting the mail server directly to retrieve and send their mail. One of the most commonly used client/server protocols that facilitates this kind of mail delivery is POP, as proposed in RFC 1725. POP supports offline mail delivery to remote clients when mail addressed to a user account is delivered via a centralized mail server. POP supports many useful features, including the ability to retain copies of e-mail on the server and to transmit a copy to the client. This can be very useful for auditing and backup purposes, as a client machine may have to be reinstalled, or it may crash, in which case, all the user s mail (including unread mail) might be lost. Reliability of service is still one of the main arguments for using a centralized mail server. To retrieve mail from a POP server, a client machine makes a TCP connection to port 110. The client then greets the server, receives an acknowledgement, and the session continues until it is terminated. During this time, a user may be authenticated. If a user is successfully authenticated, they may begin conducting transactions in the form of
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27:
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retrieving messages, until the QUIT command is received by the server, in which case the session is terminated. Errors are indicated by status codes like ERR for negative responses and +OK for positive responses. POP is deliberately SMTP-like in its command set and operation, making it easier for administrators to apply their skills to configuring both kinds of systems. One of the drawbacks of POP is its lack of security: although users are authenticated using their username and password on the mail server, this exchange is not encrypted, and so anyone snooping the network might be able to retrieve this username and password. This would allow a rogue user to log into the mail server as the mail user perhaps without the mail user realizing this for a long time, because they themselves never log in directly to the mail server. Since telnet and ftp use exactly the same method of authentication, it s certainly no worse than many standard network applications. To obtain a free POP server for Solaris, download the freeware Qpopper server from QUALCOMM at http://www.eudora.com/qpopper/index.html. Alternatively, Netra systems are supplied with the SUNWipop package, which provides a POP service for that platform. QUALCOMM also has a free POP MUA called Eudora, which is very popular in educational institutions and is available for both Macintosh and Windows platforms. Figure 27-2 shows the main user screen for Eudora: users can retrieve their mail from a remote server and display it ordered by date, sender, and subject. In addition, files from the local Macintosh or Windows file system can be sent as attachments by using the MIME extensions. Software like Eudora makes it easy for Macintosh and Windows users to have the convenience of local file access and GUI-based interfaces while retaining the security and reliability of the Solaris server platform. However, note that browsers such as Netscape and other command-line MUAs (such as elm or pine) may be more appropriate than Eudora for some environments.
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