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Does nothing special with UUCP addresses. Don't pass addresses for canonification. Use a mailer table file, /etc/mail/mailtertable, to override routing for particular domains. Uses a domain table file, /etc/mail/domaintable, to map one domain to another. Useful if you change your domain name. Domain feature for UUCP hosts. Adds the local host domain to local mail on your system (those for which you would only need a user name). Causes recipient addresses to also masquerade as being from the masquerade host. Masquerades all hosts within the domain specified in MASQUERADE_AS. Masquerade envelope sender and recipient along with headers. For virtual hosts; maps virtual addresses to real addresses. Turns a Sendmail server into a null client, which simply forwards mail messages to a central mail server for processing. Uses an LMTP-capable local mailer. Uses procmail as the local mailer. Uses the Sendmail Restricted SHell (smrsh) for mailing. Allows you to relay mail, allowing mail to be received from outside your domain and sent on to hosts outside your domain. Allows any host in your domain to relay mail (default limits this to hosts in the access database). Checks for relay permission for particular hosts instead of domains. Allows sender e-mail address to be single user names instead of just fully qualified names that include domain names. Allows Sendmail to accept unresolvable domain names. Useful for those users in a local network blocked by a firewall from the full DNS namespace. By default, Sendmail requires domains in addresses to be resolvable with DNS. Accept or reject mail from domains and hosts in the access

F I G U R E 2-5

uucpdomain always_add_domain allmasquerade masquerade_entire_domain masquerade_envelope virtusertable nullclient

Table 26-3: Sendmail Features Description database. Blocks mail to certain users, such as those that should never receive mail-like the users nobody, host, and yp. Rejects hosts in the Realtime Blackhole List. Managed by MAPS (Mail Abuse Prevention System LLC) and designed to limit transport of unwanted mass email.maps.vix.com/rbl/ Enables LDAP use.

1. Modify the program in Fig. 5.4 so that it also uses the bumper sensors. The new pro-

In addition, you can set certain configuration options. These are variables beginning with the prefix "conf" that you can set and assign values to using the define command. There are an extensive number of configuration options, most of which you will not need to change. Table 26-4 lists several of the commonly used ones. The following example defines the confAUTO_REBUILD configuration option, which will automatically rebuild the aliases database if needed.

define(`confAUTO_REBUILD')

Options confMAILER_NAME confDOMAIN_NAME confCF_VERSION confCW_FILE confCT_FILE confCR_FILE confUSERDB_SPEC confALIAS_WAIT

even if other sensors are also triggered. Modify the program so that it will turn 180 ( 30 ) if only the front sensor is triggered. Consider the differences in the behavior you see between the two programs. 3. Modify the program in Fig. 5.7 so that it will not get stuck between two objects.

Table 26-4: Sendmail Configuration Options Description The sender name used for internally generated outgoing messages. Your domain name. Used only if your system cannot determine your local domain name. Appended to the configuration version name. File that holds alternate hostnames for server. File that holds trusted users. File that holds relay domains. Specifies the user database. Time to wait to rebuild aliases database. Minimum number of free blocks needed on file system for Sendmail to accept new mail. The maximum size of messages that will be accepted (in bytes). Default delivery mode. Automatically rebuilds alias file if needed. Error message mode. Error message header/file. Default options for DNS resolver. Set the Sendmail log level. The timeout waiting for an initial connect to

confMIN_FREE_BLOCKS confMAX_MESSAGE_SIZE confDELIVERY_MODE confAUTO_REBUILD confERROR_MODE confERROR_MESSAGE confBIND_OPTS confLOG_LEVEL confTO_CONNECT

HINT:

Table 26-4: Sendmail Configuration Options Description complete. Includes sender in group expansions. The timeout waiting for a response on the initial connect. The timeout waiting for a response to an IDENT query. The timeout before a message is returned as undeliverable. If the server is the best MX for a host and hasn't made other arrangements, try connecting to the host directly. Default user ID.

confDOUBLE_BOUNCE_ADDRESS If an error occurs when sending an error message, send that "double bounce" error message to this address. confDONT_PROBE_INTERFACES If set, Sendmail will not insert the names and addresses of any local interfaces into the list of known "equivalent" addresses. confMAX_RCPTS_PER_MESSAGE Allow no more than the specified number of recipients in an SMTP envelope. Certain macros and types of macros need to be placed in the sendmail.mc file in a particular sequence as shown here. Notice that MAILER is toward the end and OSTYPE at the beginning. Local macro definitions (define) and FEATURE entries follow the OSTYPE and DOMAIN entries.

The local macro and configuration option definitions that affect a particular feature need to be entered before the FEATURE entry. For example, the redirect feature uses the aliases file. Any local definition of the aliases file needs to be entered before the redirect feature.

an object and note what effect larger and smaller angles have on the robot s behavior. Note the effect of changing or eliminating the random amount. 5. Develop an algorithm to create your own behavior for the robot. Test it in a variety of situations to see how it compares with the behaviors studied in this chapter.

define('ALIAS_FILE','/etc/aliases') FEATURE(redirect)

Probability %

You need to be careful how you enter comments into a sendmail.mc file. This file is read as a stream of macros, ignoring all white spaces including newlines. There are no special comment characters that are looked for. Instead, you have to simulate comment indicators using the dnl