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confDEF_USER_ID
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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.
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VERSIONID OSTYPE DOMAIN define FEATURE local macro definitions MAILER LOCAL_RULE_* LOCAL_RULESETS
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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.
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define('ALIAS_FILE','/etc/aliases') FEATURE(redirect)
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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
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or divert commands. The dnl command instructs that all characters following that dnl command up to and including the next newline are to be ignored. If you place a dnl command at the beginning of a text line in the sendmain.mc file, it has the effect of turning that line into a comment, ignoring everything on that line-including its newline. Even empty lines will require a dnl entry to ignore the newline character:
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dnl you will have to /etc/sendmail.cf by running this the m4 dnl macro config through preprocessor: dnl
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Alternatively you can use the divert command. The divert command will ignore all data until another divert command is reached:
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divert(-1) This is the macro config file used to generate the /etc/sendmail.cf file. If you modify the file regenerate you will have to regenerate /etc/sendmail.cf by running the m4 macro divert(0)
For Sendmail to work at all, it only requires that the OSTYPE and MAILERS macros, and any needed features and options, be defined. A very simple Sendmail file is shown here. mysendmail.mc
dnl My sendmail.mc file OSTYPE(`linux') define(`PROCMAIL_MAILER_PATH',`/usr/bin/procmail') FEATURE(redirect) MAILER(procmail) MAILER(smtp)
A sendmail.mc file usually contains many more entries, particularly for parameters and features. The default Red Hat sendmail.mc file is shown here. /etc/sendmail.mc
divert(-1) dnl This is the sendmail macro config file. If you make changes to this file, dnl you need the sendmail-cf rpm installed and then have to generate a dnl new /etc/sendmail.cf by running the following command: dnl dnl m4 /etc/mail/sendmail.mc > /etc/sendmail.cf dnl include(`/usr/share/sendmail-cf/m4/cf.m4') VERSIONID(`linux setup for Red Hat Linux')dnl OSTYPE(`linux') define(`confDEF_USER_ID',``8:12'')dnl undefine(`UUCP_RELAY')dnl undefine(`BITNET_RELAY')dnl define(`confAUTO_REBUILD')dnl define(`confTO_CONNECT', `1m')dnl
define(`confTRY_NULL_MX_LIST',true)dnl define(`confDONT_PROBE_INTERFACES',true)dnl define(`PROCMAIL_MAILER_PATH',`/usr/bin/procmail')dnl define(`ALIAS_FILE', `/etc/aliases')dnl define(`STATUS_FILE', `/var/log/sendmail.st')dnl define(`UUCP_MAILER_MAX', `2000000')dnl define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl define(`confAUTH_OPTIONS', `A')dnl dnl TRUST_AUTH_MECH(`DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl dnl define(`confAUTH_MECHANISMS', `DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl dnl define(`confTO_QUEUEWARN', `4h')dnl dnl define(`confTO_QUEUERETURN', `5d')dnl dnl define(`confQUEUE_LA', `12')dnl dnl define(`confREFUSE_LA', `18')dnl dnl FEATURE(delay_checks)dnl FEATURE(`no_default_msa',`dnl')dnl FEATURE(`smrsh',`/usr/sbin/smrsh')dnl FEATURE(`mailertable',`hash -o /etc/mail/mailertable')dnl FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable')dnl FEATURE(redirect)dnl FEATURE(always_add_domain)dnl FEATURE(use_cw_file)dnl FEATURE(use_ct_file)dnl FEATURE(local_procmail)dnl FEATURE(`access_db')dnl FEATURE(`blacklist_recipients')dnl EXPOSED_USER(`root')dnl dnl This changes sendmail to only listen on the loopback device 127.0.0.1 dnl and not on any other network devices. Comment this out if you want dnl to accept email over the network. DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl dnl We strongly recommend to comment this one out if you want to protect dnl yourself from spam. However, the laptop and users on computers that do dnl not have 24x7 DNS do need this. FEATURE(`accept_unresolvable_domains')dnl MAILER(smtp)dnl MAILER(procmail)dnl
Sendmail Masquerading
For a mail server that is relaying messages from localhosts to the Internet, you may want to masquerade the source of the messages. In large networks that have their own mail servers connected to the Internet, Sendmail masquerading can make messages sent by localhosts appear to be sent by the mail server. Their host address will be replaced by the mail server's address. Returned mail can then be sent to the mail server and held in POP or IMAP server mailboxes that can be later accessed by users on the localhosts. Also, entries in the server's virtualusertable could forward mail to corresponding users in localhosts. Masquerading is often used to masque localhosts with a domain name. Any subdomains can also be masqueraded. This method can be applied to situations where an ISP or your network administrator have assigned your network its own domain name. You can then masque all mail messages as coming from your domain name instead of from particular hosts or from subdomains you may have. For example, if a network's official domain name is mytrek.com, then all messages from the hosts in the mytrek.com network such as rabbit.mytrek.com and
turtle.mytrek.com, could be masqueraded to appear as just coming from mytrek.com. Should the mytrek.com network have a subnetwork whose domain is mybeach.com, then any messages from mybeach.com could also be masqueraded as coming from mytrek.com. You could also use masquerading to allow you to use your own Sendmail server to send mail through an ISP that has not given you your own domain. This is the case for many standalone Internet connections where the ISP connects just one host to the Internet, making it part of its own ISP domain. In this case you would masquerade your local domain as that of the ISP's mail domain. Any mail from hosts in mytrek.com would be masqueraded as coming from myisp.com. The users sending mail would have to correspond to user mail accounts already set up for you by your ISP. Received mail would still be handled by the ISP mail servers. On the other hand, it is just as easy to use the ISP's mail servers for sending mail (provided they are up and running). Masquerading is turned on with the MASQUERADE_AS command. This takes as its argument the name you want to masquerade your mail as. Normally, the name used is just the domain name, without the mail host. In the following example, the mail is masqueraded as simply mytrek.com. Mail sent from a localhost like turtle.mytrek.com will appear to be sent by just mytrek.com:
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