smtp - Unix, Linux Command

smtp [generic Postfix daemon options]


The SMTP+LMTP 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 status reports are sent
to the bounce(8), defer(8) or trace(8) daemon as
appropriate.


The SMTP+LMTP 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 a server is not reachable, or when mail delivery fails due
to a recoverable error condition, the SMTP+LMTP client will try to
deliver the mail to an alternate host.


After a successful mail transaction, a connection may be saved
to the scache(8) connection cache server, so that it
may be used by any SMTP+LMTP client for a subsequent transaction.


By default, connection caching is enabled temporarily for
destinations that have a high volume of mail in the active
queue. Session caching can be enabled permanently for
specific destinations.







RFC 821 (SMTP protocol)
RFC 822 (ARPA Internet Text Messages)
RFC 1651 (SMTP service extensions)
RFC 1652 (8bit-MIME transport)
RFC 1870 (Message Size Declaration)
RFC 2033 (LMTP protocol)
RFC 2034 (SMTP Enhanced Error Codes)
RFC 2045 (MIME: Format of Internet Message Bodies)
RFC 2046 (MIME: Media Types)
RFC 2554 (AUTH command)
RFC 2821 (SMTP protocol)
RFC 2920 (SMTP Pipelining)
RFC 3207 (STARTTLS command)
RFC 3461 (SMTP DSN Extension)
RFC 3463 (Enhanced Status Codes)


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


SMTP and LMTP connection caching assumes that SASL credentials
are valid for all destinations that map onto the same IP
address and TCP port.




Most smtp_xxx configuration parameters have an
lmtp_xxx "ghost" parameter for the equivalent LMTP
feature. This document describes only those LMTP-related
parameters that aren’t simply "ghost" parameters.


Changes to main.cf are picked up automatically, as smtp(8)
processes run for only a limited amount of time. Use the command
"postfix reload" to speed up a change.


The text below provides only a parameter summary. See
postconf(5) for more details including examples.



















qmgr(8), queue manager
bounce(8), delivery status reports
scache(8), connection cache server
postconf(5), configuration parameters
master(5), generic daemon options
master(8), process manager
tlsmgr(8), TLS session and PRNG management
syslogd(8), system logging



SASL_README, Postfix SASL howto
TLS_README, Postfix STARTTLS howto



Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA

Command pipelining in cooperation with:
Jon Ribbens
Oaktree Internet Solutions Ltd.,
Internet House,
Canal Basin,
Coventry,
CV1 4LY, United Kingdom.

SASL support originally by:
Till Franke
SuSE Rhein/Main AG
65760 Eschborn, Germany

Connection caching in cooperation with:
Victor Duchovni
Morgan Stanley

TLS support originally by:
Lutz Jaenicke
BTU Cottbus
Allgemeine Elektrotechnik
Universitaetsplatz 3-4
D-03044 Cottbus, Germany


Command pipelining in cooperation with:
Jon Ribbens
Oaktree Internet Solutions Ltd.,
Internet House,
Canal Basin,
Coventry,
CV1 4LY, United Kingdom.


SASL support originally by:
Till Franke
SuSE Rhein/Main AG
65760 Eschborn, Germany


Connection caching in cooperation with:
Victor Duchovni
Morgan Stanley


TLS support originally by:
Lutz Jaenicke
BTU Cottbus
Allgemeine Elektrotechnik
Universitaetsplatz 3-4
D-03044 Cottbus, Germany


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