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EXPN stands for expand and allows someone to Telnet to your MTA and query a name. If that name is an alias for multiple recipients, that EXPN command expands that alias into a list of those users. On a Sendmail server using a .forward file, the EXPN command will also show the real forwarding destination of mail. Or you can issue EXPN for the root user and see who receives mail addressed to the system administrator. As you can imagine, this is dangerous both from a security point of view, as attackers can identify a variety of potential user accounts on your system, and from a spam point of view, as spammers can gather considerable numbers of addresses by expanding aliases. As with disabling VRFY, you use the same confPRIVACY_FLAGS option for EXPN. In Listing 7-18 you can see the argument for disabling EXPN added to the confPRIVACY_FLAGS option. Listing 7-18. Disabling EXPN in Sendmail define(`confPRIVACY_FLAGS', `novrfy,noexpn') Rebuild sendmail.cf, and restart Sendmail. When you issue an EXPN, as shown in Listing 7-19, you should see results. Listing 7-19. Results from Sendmail with EXPN Disabled EXPN 502 5.7.0 Sorry, we do not allow this operation

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How long it takes to download files from the Internet is determined strictly by the bandwidth (speed) of your Internet connection. This has nothing to do with the CPU or RAM. The only way to speed up Internet access is to get a faster Internet account. Putting a faster computer on a slow Internet account won t speed up your Internet access one iota.

In Postfix the EXPN is not implemented by default, and in Listing 7-20 you can see how Postfix will respond to EXPN requests. Listing 7-20. EXPN in Postfix EXPN jim 502 Error: command not implemented

on behalf of their clients. Other investors include individuals who put their own money into the capital markets pot. Generally speaking, companies that need money can get it in one of two ways. They can take it in exchange for a piece of the company that is, they can sell equity or ownership, by giving the investor shares of stock in the company. Or they can borrow the money, and pay it back to the investor with interest, selling the investor debt for example, bonds. On the other side of the equation, those who want to invest their money can do so, again generally speaking, in either stocks or bonds, and there are usually specialists in each area. (Of course, hybrid financing vehicles, like convertible bonds, are an option, but this discussion focuses just on equity and debt.) Equity shares can be traded publicly on either the New York Stock Exchange or The American Stock Exchange, which are open auction floors, or the NASDAQ and Over-The-Counter exchanges, which are buyer-to-seller negotiated systems. Debt trades publicly on the bond or fixed income markets. A company that has equity or debt that trades publicly is subject to the rules and regulations, significantly augmented and expanded in recent years, of the Securities and Exchange Commission.

Before disabling the ETRN command, you need to put some thought into whether disabling it is the most appropriate choice The command is a more secure enhancement of the TURN command It is designed to assist hosts that are not permanently connected to the Internet The mail for the occasionally connected hosts is accumulated at another SMTP server, and, when the host connects to the Internet, the host sends an ETRN command that instructs the storing SMTP Server to deliver all the stored mail If the given SMTP server does not have any stored messages, it does not reply to your SMTP server and the SMTP connection times out In most cases, ETRN does not pose a significant risk, but at least one exploit has used ETRN for a DoS service attack in the past.

Another type of columnar report displays one main record per page (like a business form) but can show many records within embedded subforms. An invoice is a typical example. This type of report can have sections that display only one record and at the same time have sections that display multiple records from the many side of a one-to-many relationship and even include totals. Figure 9.3 shows an invoice report (rptInvoice) from the Collectible Mini Cars database system in Report view. In Figure 9.3, the information in the top portion of the report is on the main part of the report, whereas the product details near the bottom of the figure are contained in a subreport embedded within the main report.