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RedHat 9 (Linux i386) - man page for smtp (redhat section 8)

SMTP(8) 			     System Manager's Manual				  SMTP(8)

NAME
       smtp - Postfix remote delivery via SMTP

SYNOPSIS
       smtp [generic Postfix daemon options]

DESCRIPTION
       The  SMTP  client processes message delivery requests from the queue manager. Each request
       specifies a queue file, a sender address, a domain or host to deliver  to,  and	recipient
       information.  This program expects to be run from the master(8) process manager.

       The SMTP client updates the queue file and marks recipients as finished, or it informs the
       queue manager that delivery should be tried  again  at  a  later  time.	Delivery  problem
       reports are sent to the bounce(8) or defer(8) daemon as appropriate.

       The  SMTP  client  looks  up  a list of mail exchanger addresses for the destination host,
       sorts the list by preference, and connects to each listed address until it finds a  server
       that responds.

       When the domain or host is specified as a comma/whitespace separated list, the SMTP client
       repeats the above process for all destinations until it finds a server that responds.

       Once the SMTP client has received the server greeting banner, no error will  cause  it  to
       proceed	to  the  next  address on the mail exchanger list. Instead, the message is either
       bounced, or its delivery is deferred until later.

SECURITY
       The SMTP client is moderately security-sensitive. It talks to  SMTP  servers  and  to  DNS
       servers on the network. The SMTP client can be run chrooted at fixed low privilege.

STANDARDS
       RFC 821 (SMTP protocol)
       RFC 1651 (SMTP service extensions)
       RFC 1870 (Message Size Declaration)
       RFC 2197 (Pipelining)
       RFC 2554 (AUTH command)
       RFC 2821 (SMTP protocol)

DIAGNOSTICS
       Problems and transactions are logged to syslogd(8).  Corrupted message files are marked so
       that the queue manager can move them to the corrupt queue for further inspection.

       Depending on the setting of the notify_classes parameter, the postmaster  is  notified  of
       bounces, protocol problems, and of other trouble.

BUGS
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.

Miscellaneous
       best_mx_transport
	      Name  of the delivery transport to use when the local machine is the most-preferred
	      mail exchanger (by default, a mailer loop is reported, and the message is bounced).

       debug_peer_level
	      Verbose  logging	level  increment  for  hosts  that  match  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  parame-
	      ter.

       disable_dns_lookups
	      Disable DNS lookups. This means that mail must be forwarded via a smart relay host.

       error_notice_recipient
	      Recipient of protocol/policy/resource/software error notices.

       fallback_relay
	      Hosts to hand off mail to if a message destination is not found or if a destination
	      is unreachable.

       ignore_mx_lookup_error
	      When a name server fails to respond to an MX query, search for an A record  instead
	      deferring mail delivery.

       inet_interfaces
	      The network interface addresses that this mail system receives mail on. When any of
	      those addresses appears in the list of mail exchangers for  a  remote  destination,
	      the list is truncated to avoid mail delivery loops.

       notify_classes
	      When  this  parameter includes the protocol class, send mail to the postmaster with
	      transcripts of SMTP sessions with protocol errors.

       smtp_always_send_ehlo
	      Always send EHLO at the start of a connection.

       smtp_never_send_ehlo
	      Never send EHLO at the start of a connection.

       smtp_bind_address
	      Numerical source network address to bind to when making a connection.

       smtp_line_length_limit
	      Length limit for SMTP message content  lines.  Zero  means  no  limit.   Some  SMTP
	      servers misbehave on long lines.

       smtp_skip_4xx_greeting
	      Skip servers that greet us with a 4xx status code.

       smtp_skip_5xx_greeting
	      Skip servers that greet us with a 5xx status code.

       smtp_skip_quit_response
	      Do not wait for the server response after sending QUIT.

       smtp_pix_workaround_delay_time
	      The  time  to  pause  before  sending .<CR><LF>, while working around the CISCO PIX
	      firewall <CR><LF>.<CR><LF> bug.

       smtp_pix_workaround_threshold_time
	      The time a message must be queued before the CISCO PIX  firewall	<CR><LF>.<CR><LF>
	      bug workaround is turned on.

Authentication controls
       smtp_sasl_auth_enable
	      Enable  per-session  authentication as per RFC 2554 (SASL).  By default, Postfix is
	      built without SASL support.

       smtp_sasl_password_maps
	      Lookup tables with per-host or domain name:password entries.  No entry for  a  host
	      means no attempt to authenticate.

       smtp_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.

Resource controls
       smtp_destination_concurrency_limit
	      Limit the number of parallel deliveries to the same destination.	The default limit
	      is taken from the default_destination_concurrency_limit parameter.

       smtp_destination_recipient_limit
	      Limit the number of recipients per message delivery.  The default  limit	is  taken
	      from the default_destination_recipient_limit parameter.

Timeout controls
       The  default  time  unit is seconds; an explicit time unit can be specified by appending a
       one-letter suffix to the value: s (seconds),  m	(minutes),  h  (hours),  d  (days)  or	w
       (weeks).

       smtp_connect_timeout
	      Timeout  for completing a TCP connection. When no connection can be made within the
	      deadline, the SMTP client tries the next address on the mail exchanger list.

       smtp_helo_timeout
	      Timeout for receiving the SMTP greeting banner.  When the server drops the  connec-
	      tion  without sending a greeting banner, or when it sends no greeting banner within
	      the deadline, the SMTP client tries the next address on the mail exchanger list.

       smtp_helo_timeout
	      Timeout for sending the HELO command, and for receiving the server response.

       smtp_mail_timeout
	      Timeout for sending the MAIL FROM command, and for receiving the server response.

       smtp_rcpt_timeout
	      Timeout for sending the RCPT TO command, and for receiving the server response.

       smtp_data_init_timeout
	      Timeout for sending the DATA command, and for receiving the server response.

       smtp_data_xfer_timeout
	      Timeout for sending the message content.

       smtp_data_done_timeout
	      Timeout for sending the "." command, and for receiving the server response. When no
	      response	is  received, a warning is logged that the mail may be delivered multiple
	      times.

       smtp_quit_timeout
	      Timeout for sending the QUIT command, and for receiving the server response.

SEE ALSO
       bounce(8) non-delivery status reports
       master(8) process manager
       qmgr(8) queue 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

											  SMTP(8)


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