diff options
Diffstat (limited to 'contrib/sendmail/cf/README')
| -rw-r--r-- | contrib/sendmail/cf/README | 167 |
1 files changed, 108 insertions, 59 deletions
diff --git a/contrib/sendmail/cf/README b/contrib/sendmail/cf/README index 6a556c8..167d6a4 100644 --- a/contrib/sendmail/cf/README +++ b/contrib/sendmail/cf/README @@ -189,6 +189,13 @@ expanded. This also applies to because ``define'' is an M4 keyword. If you want to use them, surround them with directed quotes, `like this'. +Since m4 uses single quotes (opening "`" and closing "'") to quote +arguments, those quotes can't be used in arguments. For example, +it is not possible to define a rejection message containing a single +quote. Usually there are simple workarounds by changing those +messages; in the worst case it might be ok to change the value +directly in the generated .cf file, which however is not advised. + Notice: ------- @@ -466,6 +473,10 @@ CYRUSV2_MAILER_ARGS [FILE /var/imap/socket/lmtp] The arguments passed change the name of the Unix domain socket, or to switch to delivery via TCP (e.g., `TCP $h lmtp') CYRUSV2_MAILER_QGRP [undefined] The queue group for the cyrusv2 mailer. +CYRUSV2_MAILER_CHARSET [undefined] If defined, messages containing 8-bit data + that ARRIVE from an address that resolves to one the + Cyrus mailer and which are converted to MIME will + be labeled with this character set. confEBINDIR [/usr/libexec] The directory for executables. Currently used for FEATURE(`local_lmtp') and FEATURE(`smrsh'). @@ -895,6 +906,12 @@ local_no_masquerade if MASQUERADE_AS is used. MASQUERADE_AS will only have effect on addresses of mail going outside the local domain. +masquerade_envelope + If masquerading is enabled (using MASQUERADE_AS) or the + genericstable is in use, this feature will cause envelope + addresses to also masquerade as being from the masquerade + host. Normally only the header addresses are masqueraded. + genericstable This feature will cause unqualified addresses (i.e., without a domain) and addresses with a domain listed in class {G} to be looked up in a map and turned into another ("generic") @@ -1058,6 +1075,9 @@ local_procmail Use procmail or another delivery agent as the local mailer. 3. Flags for the mailer [default: SPfhn9] Empty arguments cause the defaults to be taken. + Note that if you are on a system with a broken + setreuid() call, you may need to add -f $f to the procmail + argument vector to pass the proper sender to procmail. For example, this allows it to use the maildrop (http://www.flounder.net/~mrsam/maildrop/) mailer instead @@ -1136,7 +1156,8 @@ relay_based_on_MX relay_mail_from Allows relaying if the mail sender is listed as RELAY in - the access map. If an optional argument `domain' is given, + the access map. If an optional argument `domain' (this + is the literal word `domain', not a placeholder) is given, relaying can be allowed just based on the domain portion of the sender address. This feature should only be used if absolutely necessary as the sender address can be easily @@ -1223,6 +1244,10 @@ dnsbl Turns on rejection of hosts found in an DNS based rejection to query different DNS based rejection lists. See also enhdnsbl for an enhanced version. + Set the DNSBL_MAP mc option to change the default map + definition from `host'. Set the DNSBL_MAP_OPT mc option + to add additional options to the map specification used. + Some DNS based rejection lists cause failures if asked for AAAA records. If your sendmail version is compiled with IPv6 support (NETINET6) and you experience this @@ -1259,6 +1284,9 @@ enhdnsbl Enhanced version of dnsbl (see above). Further arguments i.e., `', is specified. This feature requires that sendmail has been compiled with the flag DNSMAP (see sendmail/README). + Set the EDNSBL_TO mc option to change the DNS retry count + from the default value of 5. + lookupdotdomain Look up also .domain in the access map. This allows to match only subdomains. It does not work well with FEATURE(`relay_hosts_only'), because most lookups for @@ -1323,15 +1351,20 @@ msp Defines config file for Message Submission Program. Some more hints about possible changes can be found below in the section MESSAGE SUBMISSION PROGRAM. - Note: if localhost doesn't resolve to the IP address - of your local system (127.0.0.1 or ::1 for IPv6), - then you either need to fix your hostname resolution - (localhost and localhost.YOUR.DOMAIN should resolve - to that address by convention) or you need to specify - the IP address as argument, e.g., + Note: Due to many problems, submit.mc uses FEATURE(`msp', `[127.0.0.1]') + by default. If you have a machine with IPv6 only, + change it to + + FEATURE(`msp', `[IPv6:::1]') + + If you want to continue using '[localhost]', (the behavior + up to 8.12.6), use + + FEATURE(`msp') + queuegroup A simple example how to select a queue group based on the full e-mail address or the domain of the recipient. Selection is done via entries in the @@ -2188,15 +2221,16 @@ A slightly better solution is FEATURE(`relay_mail_from') which allows relaying if the mail sender is listed as RELAY in the -access map. If an optional argument `domain' is given, the domain -portion of the mail sender is also checked to allowing relaying. -This option only works together with the tag From: for the LHS of -the access map entries (see below: Finer control...). This feature -allows spammers to abuse your mail server by specifying a return -address that you enabled in your access file. This may be harder -to figure out for spammers, but it should not be used unless -necessary. Instead use SMTP AUTH or STARTTLS to allow relaying -for roaming users. +access map. If an optional argument `domain' (this is the literal +word `domain', not a placeholder) is given, the domain portion of +the mail sender is also checked to allowing relaying. This option +only works together with the tag From: for the LHS of the access +map entries (see below: Finer control...). This feature allows +spammers to abuse your mail server by specifying a return address +that you enabled in your access file. This may be harder to figure +out for spammers, but it should not be used unless necessary. +Instead use SMTP AUTH or STARTTLS to allow relaying for roaming +users. If source routing is used in the recipient address (e.g., @@ -2341,7 +2375,7 @@ The value part of the map can contain: For example: - cyberspammer.com ERROR:550 "We don't accept mail from spammers" + cyberspammer.com ERROR:"550 We don't accept mail from spammers" okay.cyberspammer.com OK sendmail.org RELAY 128.32 RELAY @@ -2465,11 +2499,15 @@ instead of just disabling the DNS lookups in the backlists. The features described above make use of the check_relay, check_mail, -and check_rcpt rulesets. If you wish to include your own checks, -you can put your checks in the rulesets Local_check_relay, -Local_check_mail, and Local_check_rcpt. For example if you wanted to -block senders with all numeric usernames (i.e. 2312343@bigisp.com), -you would use Local_check_mail and the regex map: +and check_rcpt rulesets. Note that check_relay checks the SMTP +client hostname and IP address when the connection is made to your +server. It does not check if a mail message is being relayed to +another server. That check is done in check_rcpt. If you wish to +include your own checks, you can put your checks in the rulesets +Local_check_relay, Local_check_mail, and Local_check_rcpt. For +example if you wanted to block senders with all numeric usernames +(i.e. 2312343@bigisp.com), you would use Local_check_mail and the +regex map: LOCAL_CONFIG Kallnumbers regex -a@MATCH ^[0-9]+$ @@ -2574,8 +2612,9 @@ the friend option and having Spam:abuse@ FRIEND -in the access map, mail to abuse@localdomain will get through. It is -also possible to specify a full address or an address with +detail: +in the access map, mail to abuse@localdomain will get through (where +"localdomain" is any domain in class {w}). It is also possible to +specify a full address or an address with +detail: Spam:abuse@my.domain FRIEND Spam:me+abuse@ FRIEND @@ -2597,9 +2636,10 @@ This is done by adding a ruleset call to the 'H' header definition command in sendmail.cf. For example, this can be used to check the validity of a Message-ID: header: - LOCAL_RULESETS + LOCAL_CONFIG HMessage-Id: $>CheckMessageId + LOCAL_RULESETS SCheckMessageId R< $+ @ $+ > $@ OK R$* $#error $: 553 Header Error @@ -2636,10 +2676,9 @@ probably not be used in production. LOCAL_CONFIG Kstorage macro - - LOCAL_RULESETS HMessage-Id: $>CheckMessageId + LOCAL_RULESETS SCheckMessageId # Record the presence of the header R$* $: $(storage {MessageIdCheck} $@ OK $) $1 @@ -2714,22 +2753,22 @@ ${server_addr} the address of the server of the current outgoing SMTP Relaying -------- -SMTP STARTTLS can allow relaying for senders who have successfully -authenticated themselves. This is done in the ruleset RelayAuth. If the -verification of the cert failed (${verify} != OK), relaying is subject to -the usual rules. Otherwise the DN of the issuer is looked up in the access -map using the tag CERTISSUER. If the resulting value is RELAY, relaying is -allowed. If it is SUBJECT, the DN of the cert subject is looked up next in -the access map using the tag CERTSUBJECT. If the value is RELAY, relaying -is allowed. -To make things a bit more flexible (or complicated), the values for +SMTP STARTTLS can allow relaying for remote SMTP clients which have +successfully authenticated themselves. This is done in the ruleset +RelayAuth. If the verification of the cert failed (${verify} != OK), +relaying is subject to the usual rules. Otherwise the DN of the issuer is +looked up in the access map using the tag CERTISSUER. If the resulting +value is RELAY, relaying is allowed. If it is SUBJECT, the DN of the cert +subject is looked up next in the access map using the tag CERTSUBJECT. If +the value is RELAY, relaying is allowed. + ${cert_issuer} and ${cert_subject} can be optionally modified by regular expressions defined in the m4 variables _CERT_REGEX_ISSUER_ and _CERT_REGEX_SUBJECT_, respectively. To avoid problems with those macros in rulesets and map lookups, they are modified as follows: each non-printable -character and the characters '<', '>', '(', ')', '"', '+' are replaced by -their HEX value with a leading '+'. For example: +character and the characters '<', '>', '(', ')', '"', '+', ' ' are replaced +by their HEX value with a leading '+'. For example: /C=US/ST=California/O=endmail.org/OU=private/CN=Darth Mail (Cert)/Email= darth+cert@endmail.org @@ -2741,6 +2780,9 @@ Darth+20Mail+20+28Cert+29/Email=darth+2Bcert@endmail.org (line breaks have been inserted for readability). +The macros which are subject to this encoding are ${cert_subject}, +${cert_issuer}, ${cn_subject}, and ${cn_issuer}. + Examples: To allow relaying for everyone who can present a cert signed by @@ -2750,7 +2792,7 @@ Darth+20Mail+20+28Cert+29/Email=darth+2Bcert@endmail.org simply use: -CERTIssuer:/C=US/ST=California/O=endmail.org/OU=private/CN= +CertIssuer:/C=US/ST=California/O=endmail.org/OU=private/CN= Darth+20Mail+20+28Cert+29/Email=darth+2Bcert@endmail.org RELAY To allow relaying only for a subset of machines that have a cert signed by @@ -2760,9 +2802,9 @@ Darth+20Mail+20+28Cert+29/Email=darth+2Bcert@endmail.org use: -CERTIssuer:/C=US/ST=California/O=endmail.org/OU=private/CN= +CertIssuer:/C=US/ST=California/O=endmail.org/OU=private/CN= Darth+20Mail+20+28Cert+29/Email=darth+2Bcert@endmail.org SUBJECT -CERTSubject:/C=US/ST=California/O=endmail.org/OU=private/CN= +CertSubject:/C=US/ST=California/O=endmail.org/OU=private/CN= DeathStar/Email=deathstar@endmail.org RELAY Note: line breaks have been inserted after "CN=" for readability, @@ -3898,9 +3940,9 @@ confLDAP_DEFAULT_SPEC LDAPDefaultSpec [undefined] Default map maps unless they are specified in the individual map specification ('K' command). -confCACERT_PATH CACERTPath [undefined] Path to directory +confCACERT_PATH CACertPath [undefined] Path to directory with certs of CAs. -confCACERT CACERTFile [undefined] File containing one CA +confCACERT CACertFile [undefined] File containing one CA cert. confSERVER_CERT ServerCertFile [undefined] File containing the cert of the server, i.e., this cert @@ -3959,17 +4001,25 @@ confINPUT_MAIL_FILTERS InputMailFilters confMILTER_LOG_LEVEL Milter.LogLevel [9] Log level for input mail filter actions, defaults to LogLevel. confMILTER_MACROS_CONNECT Milter.macros.connect - [empty] Macros to transmit to milters - when a session connection starts. + [j, _, {daemon_name}, {if_name}, + {if_addr}] Macros to transmit to + milters when a session connection + starts. confMILTER_MACROS_HELO Milter.macros.helo - [empty] Macros to transmit to milters - after HELO command. + [{tls_version}, {cipher}, + {cipher_bits}, {cert_subject}, + {cert_issuer}] Macros to transmit to + milters after HELO/EHLO command. confMILTER_MACROS_ENVFROM Milter.macros.envfrom - [empty] Macros to transmit to milters - after MAIL FROM command. + [i, {auth_type}, {auth_authen}, + {auth_ssf}, {auth_author}, + {mail_mailer}, {mail_host}, + {mail_addr}] Macros to transmit to + milters after MAIL FROM command. confMILTER_MACROS_ENVRCPT Milter.macros.envrcpt - [empty] Macros to transmit to milters - after RCPT TO command. + [{rcpt_mailer}, {rcpt_host}, + {rcpt_addr}] Macros to transmit to + milters after RCPT TO command. See also the description of OSTYPE for some parameters that can be @@ -4020,13 +4070,12 @@ Example 3: To listen on both IPv4 and IPv6 interfaces, use A "Message Submission Agent" still uses all of the same rulesets for processing the message (and therefore still allows message rejection via the check_* rulesets). In accordance with the RFC, the MSA will ensure -that all domains in the envelope are fully qualified if the message is -relayed to another MTA. It will also enforce the normal address syntax -rules and log error messages. Additionally, by using the M=a modifier -you can require authentication before messages are accepted by the MSA. -Notice: Do NOT use the 'a' modifier on a public accessible MTA! -Finally, the M=E modifier shown above disables ETRN as required by RFC -2476. +that all domains in envelope addresses are fully qualified if the message +is relayed to another MTA. It will also enforce the normal address syntax +rules and log error messages. Additionally, by using the M=a modifier you +can require authentication before messages are accepted by the MSA. +Notice: Do NOT use the 'a' modifier on a public accessible MTA! Finally, +the M=E modifier shown above disables ETRN as required by RFC 2476. Mail filters can be defined using the INPUT_MAIL_FILTER() and MAIL_FILTER() commands: @@ -4311,4 +4360,4 @@ M4 DIVERSIONS 8 DNS based blacklists 9 special local rulesets (1 and 2) -$Revision: 8.623.2.1 $, Last updated $Date: 2002/08/07 23:14:56 $ +$Revision: 8.623.2.18 $, Last updated $Date: 2002/12/29 04:16:51 $ |
