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SMTPD(8) System Manager's Manual SMTPD(8)
NAME
smtpd - Postfix SMTP server
SYNOPSIS
smtpd [generic Postfix daemon options]
DESCRIPTION
The SMTP server accepts network connection requests and performs zero or more SMTP transactions per connection. Each received message is
piped through the cleanup(8) daemon, and is placed into the incoming queue as one single queue file. For this mode of operation, the pro-
gram expects to be run from the master(8) process manager.
Alternatively, the SMTP server takes an established connection on standard input and deposits messages directly into the maildrop queue. In
this so-called stand-alone mode, the SMTP server can accept mail even while the mail system is not running.
The SMTP server implements a variety of policies for connection requests, and for parameters given to HELO, ETRN, MAIL FROM, VRFY and RCPT
TO commands. They are detailed below and in the main.cf configuration file.
SECURITY
The SMTP server is moderately security-sensitive. It talks to SMTP clients and to DNS servers on the network. The SMTP server can be run
chrooted at fixed low privilege.
STANDARDS
RFC 821 (SMTP protocol)
RFC 1123 (Host requirements)
RFC 1652 (8bit-MIME transport)
RFC 1869 (SMTP service extensions)
RFC 1854 (SMTP Pipelining)
RFC 1870 (Message Size Declaration)
RFC 1985 (ETRN command)
RFC 2554 (AUTH command)
RFC 2821 (SMTP protocol)
DIAGNOSTICS
Problems and transactions are logged to syslogd(8).
Depending on the setting of the notify_classes parameter, the postmaster is notified of bounces, protocol problems, policy violations, and
of other trouble.
CONFIGURATION PARAMETERS
The following main.cf parameters are especially relevant to this program. See the Postfix main.cf file for syntax details and for default
values. Use the postfix reload command after a configuration change.
Compatibility controls
strict_rfc821_envelopes
Disallow non-RFC 821 style addresses in SMTP commands. For example, the RFC822-style address forms with comments that Sendmail
allows.
broken_sasl_auth_clients
Support older Microsoft clients that mis-implement the AUTH protocol, and that expect an EHLO response of "250 AUTH=list" instead of
"250 AUTH list".
smtpd_noop_commands
List of commands that are treated as NOOP (no operation) commands, without any parameter syntax checking and without any state
change. This list overrides built-in command definitions.
Content inspection controls
content_filter
The name of a mail delivery transport that filters mail and that either bounces mail or re-injects the result back into Postfix.
This parameter uses the same syntax as the right-hand side of a Postfix transport table.
Authentication controls
enable_sasl_authentication
Enable per-session authentication as per RFC 2554 (SASL). This functionality is available only when explicitly selected at program
build time and explicitly enabled at runtime.
smtpd_sasl_local_domain
The name of the local authentication realm.
smtpd_sasl_security_options
Zero or more of the following.
noplaintext
Disallow authentication methods that use plaintext passwords.
noactive
Disallow authentication methods that are vulnerable to non-dictionary active attacks.
nodictionary
Disallow authentication methods that are vulnerable to passive dictionary attack.
noanonymous
Disallow anonymous logins.
smtpd_sender_login_maps
Maps that specify the SASL login name that owns a MAIL FROM sender address. Used by the reject_sender_login_mismatch sender anti-
spoofing restriction.
Miscellaneous
always_bcc
Address to send a copy of each message that enters the system.
command_directory
Location of Postfix support commands (default: $program_directory).
debug_peer_level
Increment in verbose logging level when a remote host matches a pattern in the debug_peer_list parameter.
debug_peer_list
List of domain or network patterns. When a remote host matches a pattern, increase the verbose logging level by the amount specified
in the debug_peer_level parameter.
default_verp_delimiters
The default VERP delimiter characters that are used when the XVERP command is specified without explicit delimiters.
error_notice_recipient
Recipient of protocol/policy/resource/software error notices.
hopcount_limit
Limit the number of Received: message headers.
local_recipient_maps
List of maps with user names that are local to $myorigin or $inet_interfaces. If this parameter is defined, then the SMTP server
rejects mail for unknown local users.
notify_classes
List of error classes. Of special interest are:
policy When a client violates any policy, mail a transcript of the entire SMTP session to the postmaster.
protocol
When a client violates the SMTP protocol or issues an unimplemented command, mail a transcript of the entire SMTP session to
the postmaster.
smtpd_banner
Text that follows the 220 status code in the SMTP greeting banner.
smtpd_recipient_limit
Restrict the number of recipients that the SMTP server accepts per message delivery.
smtpd_timeout
Limit the time to send a server response and to receive a client request.
soft_bounce
Change hard (5xx) reject responses into soft (4xx) reject responses. This can be useful for testing purposes.
verp_delimiter_filter
The characters that Postfix accepts as VERP delimiter characters.
Resource controls
line_length_limit
Limit the amount of memory in bytes used for the handling of partial input lines.
message_size_limit
Limit the total size in bytes of a message, including on-disk storage for envelope information.
queue_minfree
Minimal amount of free space in bytes in the queue file system for the SMTP server to accept any mail at all.
smtpd_history_flush_threshold
Flush the command history to postmaster after receipt of RSET etc. only if the number of history lines exceeds the given threshold.
Tarpitting
smtpd_error_sleep_time
Time to wait in seconds before sending a 4xx or 5xx server error response.
smtpd_soft_error_limit
When an SMTP client has made this number of errors, wait error_count seconds before responding to any client request.
smtpd_hard_error_limit
Disconnect after a client has made this number of errors.
smtpd_junk_command_limit
Limit the number of times a client can issue a junk command such as NOOP, VRFY, ETRN or RSET in one SMTP session before it is penal-
ized with tarpit delays.
UCE control restrictions
parent_domain_matches_subdomains
List of Postfix features that use domain.tld patterns to match sub.domain.tld (as opposed to requiring .domain.tld patterns).
smtpd_client_restrictions
Restrict what clients may connect to this mail system.
smtpd_helo_required
Require that clients introduce themselves at the beginning of an SMTP session.
smtpd_helo_restrictions
Restrict what client hostnames are allowed in HELO and EHLO commands.
smtpd_sender_restrictions
Restrict what sender addresses are allowed in MAIL FROM commands.
smtpd_recipient_restrictions
Restrict what recipient addresses are allowed in RCPT TO commands.
smtpd_etrn_restrictions
Restrict what domain names can be used in ETRN commands, and what clients may issue ETRN commands.
allow_untrusted_routing
Allow untrusted clients to specify addresses with sender-specified routing. Enabling this opens up nasty relay loopholes involving
trusted backup MX hosts.
smtpd_restriction_classes
Declares the name of zero or more parameters that contain a list of UCE restrictions. The names of these parameters can then be used
instead of the restriction lists that they represent.
smtpd_null_access_lookup_key
The lookup key to be used in SMTPD access tables instead of the null sender address. A null sender address cannot be looked up.
maps_rbl_domains
List of DNS domains that publish the addresses of blacklisted hosts.
permit_mx_backup_networks
Only domains whose primary MX hosts match the listed networks are eligible for the permit_mx_backup feature.
relay_domains
Restrict what domains or networks this mail system will relay mail from or to.
UCE control responses
access_map_reject_code
Server response when a client violates an access database restriction.
invalid_hostname_reject_code
Server response when a client violates the reject_invalid_hostname restriction.
maps_rbl_reject_code
Server response when a client violates the maps_rbl_domains restriction.
reject_code
Response code when the client matches a reject restriction.
relay_domains_reject_code
Server response when a client attempts to violate the mail relay policy.
unknown_address_reject_code
Server response when a client violates the reject_unknown_address restriction.
unknown_client_reject_code
Server response when a client without address to name mapping violates the reject_unknown_clients restriction.
unknown_hostname_reject_code
Server response when a client violates the reject_unknown_hostname restriction.
SEE ALSO
cleanup(8) message canonicalization
master(8) process manager
syslogd(8) system logging
LICENSE
The Secure Mailer license must be distributed with this software.
AUTHOR(S)
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
SMTPD(8)