! COMMAND PIPELINING after time from [address]:port!
Translation: the SMTP client at [address]:port sent multiple ! SMTP commands, instead of sending one command and then waiting for ! the server to reply. This happened time seconds after the ! "220 " server greeting was sent.
The postscreen_pipelining_action parameter specifies the action that is taken next. See "When tests fail --- 432,445 ---- as:
! COMMAND PIPELINING from [address]:port after command!
Translation: the SMTP client at [address]:port sent ! multiple SMTP commands, instead of sending one command and then ! waiting for the server to reply. This happened after the client ! sent command. Postfix 2.8 does not log the input that was ! sent too early.
The postscreen_pipelining_action parameter specifies the action
that is taken next. See "When tests fail
***************
*** 701,707 ****
Uncomment the new "smtpd pass ... smtpd" service
in master.cf, and duplicate any "-o parameter=value" entries
! from the smtpd service that was commented out in step 1. Uncomment the new "smtpd pass ... smtpd" service
in master.cf, and duplicate any "-o parameter=value" entries
! from the smtpd service that was commented out in the previous step.
!
/etc/postfix/master.cf:
--- 702,709 ----
/etc/postfix/master.cf:
diff -cr --new-file /var/tmp/postfix-2.8.0/html/postscreen.8.html ./html/postscreen.8.html
*** /var/tmp/postfix-2.8.0/html/postscreen.8.html Mon Jan 17 19:40:55 2011
--- ./html/postscreen.8.html Tue Feb 22 17:22:32 2011
***************
*** 61,67 ****
RFC 1985 (ETRN command)
RFC 2034 (SMTP Enhanced Status Codes)
RFC 2821 (SMTP protocol)
! RFC 2920 (SMTP Pipelining)
RFC 3207 (STARTTLS command)
RFC 3461 (SMTP DSN Extension)
RFC 3463 (Enhanced Status Codes)
--- 61,67 ----
RFC 1985 (ETRN command)
RFC 2034 (SMTP Enhanced Status Codes)
RFC 2821 (SMTP protocol)
! Not: RFC 2920 (SMTP Pipelining)
RFC 3207 (STARTTLS command)
RFC 3461 (SMTP DSN Extension)
RFC 3463 (Enhanced Status Codes)
***************
*** 76,139 ****
Support for AUTH may be added in the future. In the mean
time, if you need to make these services available on port
25, then do not enable the optional "after 220 server
! greeting" tests.
! The optional "after 220 server greeting" tests involve
! postscreen(8)'s built-in SMTP protocol engine. When these
tests succeed, postscreen(8) adds the client to the tempo-
! rary whitelist but it cannot not hand off the "live" con-
! nection to a Postfix SMTP server process in the middle of
! a session. Instead, postscreen(8) defers attempts to
! deliver mail with a 4XX status, and waits for the client
! to disconnect. The next time a good client connects, it
! will be allowed to talk to a Postfix SMTP server process
! to deliver mail. postscreen(8) mitigates the impact of
! this limitation by giving such tests a long expiration
time.
CONFIGURATION PARAMETERS
! Changes to main.cf are not picked up automatically, as
! postscreen(8) processes may run for several hours. Use
the command "postfix reload" after a configuration change.
! The text below provides only a parameter summary. See
postconf(5) for more details including examples.
NOTE: Some postscreen(8) parameters implement stress-
! dependent behavior. This is supported only when the
! default parameter value is stress-dependent (that is, it
! looks like ${stress?X}${stress:Y}, or it is the $name of
an smtpd parameter with a stress-dependent default).
! Other parameters always evaluate as if the stress parame-
ter value is the empty string.
COMPATIBILITY CONTROLS
postscreen_command_filter ($smtpd_command_filter)
! A mechanism to transform commands from remote SMTP
clients.
postscreen_discard_ehlo_keyword_address_maps ($smtpd_dis-
card_ehlo_keyword_address_maps)
! Lookup tables, indexed by the remote SMTP client
! address, with case insensitive lists of EHLO key-
! words (pipelining, starttls, auth, etc.) that the
! postscreen(8) server will not send in the EHLO
response to a remote SMTP client.
postscreen_discard_ehlo_keywords ($smtpd_discard_ehlo_key-
words)
! A case insensitive list of EHLO keywords (pipelin-
! ing, starttls, auth, etc.) that the postscreen(8)
! server will not send in the EHLO response to a
remote SMTP client.
TROUBLE SHOOTING CONTROLS
postscreen_expansion_filter (see 'postconf -d' output)
! List of characters that are permitted in
postscreen_reject_footer attribute expansions.
postscreen_reject_footer ($smtpd_reject_footer)
! Optional information that is appended after a 4XX
or 5XX server response.
soft_bounce (no)
--- 76,140 ----
Support for AUTH may be added in the future. In the mean
time, if you need to make these services available on port
25, then do not enable the optional "after 220 server
! greeting" tests, and do not use DNSBLs that reject traffic
! from dial-up and residential networks.
! The optional "after 220 server greeting" tests involve
! postscreen(8)'s built-in SMTP protocol engine. When these
tests succeed, postscreen(8) adds the client to the tempo-
! rary whitelist but it cannot not hand off the "live" con-
! nection to a Postfix SMTP server process in the middle of
! a session. Instead, postscreen(8) defers attempts to
! deliver mail with a 4XX status, and waits for the client
! to disconnect. The next time a good client connects, it
! will be allowed to talk to a Postfix SMTP server process
! to deliver mail. postscreen(8) mitigates the impact of
! this limitation by giving such tests a long expiration
time.
CONFIGURATION PARAMETERS
! Changes to main.cf are not picked up automatically, as
! postscreen(8) processes may run for several hours. Use
the command "postfix reload" after a configuration change.
! The text below provides only a parameter summary. See
postconf(5) for more details including examples.
NOTE: Some postscreen(8) parameters implement stress-
! dependent behavior. This is supported only when the
! default parameter value is stress-dependent (that is, it
! looks like ${stress?X}${stress:Y}, or it is the $name of
an smtpd parameter with a stress-dependent default).
! Other parameters always evaluate as if the stress parame-
ter value is the empty string.
COMPATIBILITY CONTROLS
postscreen_command_filter ($smtpd_command_filter)
! A mechanism to transform commands from remote SMTP
clients.
postscreen_discard_ehlo_keyword_address_maps ($smtpd_dis-
card_ehlo_keyword_address_maps)
! Lookup tables, indexed by the remote SMTP client
! address, with case insensitive lists of EHLO key-
! words (pipelining, starttls, auth, etc.) that the
! postscreen(8) server will not send in the EHLO
response to a remote SMTP client.
postscreen_discard_ehlo_keywords ($smtpd_discard_ehlo_key-
words)
! A case insensitive list of EHLO keywords (pipelin-
! ing, starttls, auth, etc.) that the postscreen(8)
! server will not send in the EHLO response to a
remote SMTP client.
TROUBLE SHOOTING CONTROLS
postscreen_expansion_filter (see 'postconf -d' output)
! List of characters that are permitted in
postscreen_reject_footer attribute expansions.
postscreen_reject_footer ($smtpd_reject_footer)
! Optional information that is appended after a 4XX
or 5XX server response.
soft_bounce (no)
***************
*** 141,149 ****
be returned to the sender.
PERMANENT WHITE/BLACKLIST TEST
! This test is executed immediately after a remote SMTP
! client connects. If a client is permanently whitelisted,
! the client will be handed off immediately to a Postfix
SMTP server process.
postscreen_access_list (permit_mynetworks)
--- 142,150 ----
be returned to the sender.
PERMANENT WHITE/BLACKLIST TEST
! This test is executed immediately after a remote SMTP
! client connects. If a client is permanently whitelisted,
! the client will be handed off immediately to a Postfix
SMTP server process.
postscreen_access_list (permit_mynetworks)
***************
*** 151,195 ****
addresses.
postscreen_blacklist_action (ignore)
! The action that postscreen(8) takes when an SMTP
! client is permanently blacklisted with the
postscreen_access_list parameter.
BEFORE-GREETING TESTS
! These tests are executed before the remote SMTP client
receives the "220 servername" greeting. If no tests remain
! after the successful completion of this phase, the client
! will be handed off immediately to a Postfix SMTP server
process.
dnsblog_service_name (dnsblog)
! The name of the dnsblog(8) service entry in mas-
ter.cf.
postscreen_dnsbl_action (ignore)
! The action that postscreen(8) takes when an SMTP
client's combined DNSBL score is equal to or
! greater than a threshold (as defined with the
postscreen_dnsbl_sites and postscreen_dnsbl_thresh-
old parameters).
postscreen_dnsbl_reply_map (empty)
! A mapping from actual DNSBL domain name which
! includes a secret password, to the DNSBL domain
name that postscreen will reply with when it
rejects mail.
postscreen_dnsbl_sites (empty)
! Optional list of DNS white/blacklist domains, fil-
ters and weight factors.
postscreen_dnsbl_threshold (1)
! The inclusive lower bound for blocking an SMTP
client, based on its combined DNSBL score as
! defined with the postscreen_dnsbl_sites parameter.
postscreen_greet_action (ignore)
! The action that postscreen(8) takes when an SMTP
client speaks before its turn within the time spec-
ified with the postscreen_greet_wait parameter.
--- 152,196 ----
addresses.
postscreen_blacklist_action (ignore)
! The action that postscreen(8) takes when an SMTP
! client is permanently blacklisted with the
postscreen_access_list parameter.
BEFORE-GREETING TESTS
! These tests are executed before the remote SMTP client
receives the "220 servername" greeting. If no tests remain
! after the successful completion of this phase, the client
! will be handed off immediately to a Postfix SMTP server
process.
dnsblog_service_name (dnsblog)
! The name of the dnsblog(8) service entry in mas-
ter.cf.
postscreen_dnsbl_action (ignore)
! The action that postscreen(8) takes when an SMTP
client's combined DNSBL score is equal to or
! greater than a threshold (as defined with the
postscreen_dnsbl_sites and postscreen_dnsbl_thresh-
old parameters).
postscreen_dnsbl_reply_map (empty)
! A mapping from actual DNSBL domain name which
! includes a secret password, to the DNSBL domain
name that postscreen will reply with when it
rejects mail.
postscreen_dnsbl_sites (empty)
! Optional list of DNS white/blacklist domains, fil-
ters and weight factors.
postscreen_dnsbl_threshold (1)
! The inclusive lower bound for blocking an SMTP
client, based on its combined DNSBL score as
! defined with the postscreen_dnsbl_sites parameter.
postscreen_greet_action (ignore)
! The action that postscreen(8) takes when an SMTP
client speaks before its turn within the time spec-
ified with the postscreen_greet_wait parameter.
***************
*** 197,235 ****
The text in the optional "220-text..." server
response that postscreen(8) sends ahead of the real
Postfix SMTP server's "220 text..." response, in an
! attempt to confuse bad SMTP clients so that they
speak before their turn (pre-greet).
postscreen_greet_wait (${stress?2}${stress:6}s)
The amount of time that postscreen(8) will wait for
! an SMTP client to send a command before its turn,
! and for DNS blocklist lookup results to arrive
! (default: up to 2 seconds under stress, up to 6
seconds otherwise).
smtpd_service_name (smtpd)
! The internal service that postscreen(8) forwards
allowed connections to.
AFTER-GREETING TESTS
! These tests are executed after the remote SMTP client
receives the "220 servername" greeting. If a client passes
! all tests during this phase, it will receive a 4XX
! response to RCPT TO commands until the client hangs up.
After this, the client will be allowed to talk directly to
a Postfix SMTP server process.
postscreen_bare_newline_action (ignore)
! The action that postscreen(8) takes when an SMTP
! client sends a bare newline character, that is, a
newline not preceded by carriage return.
postscreen_bare_newline_enable (no)
! Enable "bare newline" SMTP protocol tests in the
postscreen(8) server.
postscreen_disable_vrfy_command ($disable_vrfy_command)
! Disable the SMTP VRFY command in the postscreen(8)
daemon.
postscreen_forbidden_commands ($smtpd_forbidden_commands)
--- 198,236 ----
The text in the optional "220-text..." server
response that postscreen(8) sends ahead of the real
Postfix SMTP server's "220 text..." response, in an
! attempt to confuse bad SMTP clients so that they
speak before their turn (pre-greet).
postscreen_greet_wait (${stress?2}${stress:6}s)
The amount of time that postscreen(8) will wait for
! an SMTP client to send a command before its turn,
! and for DNS blocklist lookup results to arrive
! (default: up to 2 seconds under stress, up to 6
seconds otherwise).
smtpd_service_name (smtpd)
! The internal service that postscreen(8) forwards
allowed connections to.
AFTER-GREETING TESTS
! These tests are executed after the remote SMTP client
receives the "220 servername" greeting. If a client passes
! all tests during this phase, it will receive a 4XX
! response to RCPT TO commands until the client hangs up.
After this, the client will be allowed to talk directly to
a Postfix SMTP server process.
postscreen_bare_newline_action (ignore)
! The action that postscreen(8) takes when an SMTP
! client sends a bare newline character, that is, a
newline not preceded by carriage return.
postscreen_bare_newline_enable (no)
! Enable "bare newline" SMTP protocol tests in the
postscreen(8) server.
postscreen_disable_vrfy_command ($disable_vrfy_command)
! Disable the SMTP VRFY command in the postscreen(8)
daemon.
postscreen_forbidden_commands ($smtpd_forbidden_commands)
***************
*** 237,393 ****
siders in violation of the SMTP protocol.
postscreen_helo_required ($smtpd_helo_required)
! Require that a remote SMTP client sends HELO or
EHLO before commencing a MAIL transaction.
postscreen_non_smtp_command_action (drop)
! The action that postscreen(8) takes when an SMTP
! client sends non-SMTP commands as specified with
the postscreen_forbidden_commands parameter.
postscreen_non_smtp_command_enable (no)
! Enable "non-SMTP command" tests in the
postscreen(8) server.
postscreen_pipelining_action (enforce)
! The action that postscreen(8) takes when an SMTP
! client sends multiple commands instead of sending
! one command and waiting for the server to respond.
postscreen_pipelining_enable (no)
! Enable "pipelining" SMTP protocol tests in the
postscreen(8) server.
CACHE CONTROLS
postscreen_cache_cleanup_interval (12h)
! The amount of time between postscreen(8) cache
cleanup runs.
postscreen_cache_map (btree:$data_direc-
tory/postscreen_cache)
! Persistent storage for the postscreen(8) server
decisions.
postscreen_cache_retention_time (7d)
The amount of time that postscreen(8) will cache an
! expired temporary whitelist entry before it is
removed.
postscreen_bare_newline_ttl (30d)
! The amount of time that postscreen(8) will use the
result from a successful "bare newline" SMTP proto-
col test.
postscreen_dnsbl_ttl (1h)
! The amount of time that postscreen(8) will use the
result from a successful DNS blocklist test.
postscreen_greet_ttl (1d)
! The amount of time that postscreen(8) will use the
result from a successful PREGREET test.
postscreen_non_smtp_command_ttl (30d)
! The amount of time that postscreen(8) will use the
! result from a successful "non_smtp_command" SMTP
protocol test.
postscreen_pipelining_ttl (30d)
! The amount of time that postscreen(8) will use the
result from a successful "pipelining" SMTP protocol
test.
RESOURCE CONTROLS
line_length_limit (2048)
! Upon input, long lines are chopped up into pieces
! of at most this length; upon delivery, long lines
are reconstructed.
postscreen_client_connection_count_limit
($smtpd_client_connection_count_limit)
! How many simultaneous connections any client is
allowed to have with the postscreen(8) daemon.
postscreen_command_count_limit (20)
! The limit on the total number of commands per SMTP
! session for postscreen(8)'s built-in SMTP protocol
engine.
postscreen_command_time_limit (${stress?10}${stress:300}s)
! The time limit to read an entire command line with
postscreen(8)'s built-in SMTP protocol engine.
postscreen_post_queue_limit ($default_process_limit)
! The number of clients that can be waiting for ser-
vice from a real SMTP server process.
postscreen_pre_queue_limit ($default_process_limit)
! The number of non-whitelisted clients that can be
! waiting for a decision whether they will receive
service from a real SMTP server process.
postscreen_watchdog_timeout (10s)
! How much time a postscreen(8) process may take to
! respond to an SMTP client command or to perform a
cache operation before it is terminated by a built-
in watchdog timer.
STARTTLS CONTROLS
postscreen_tls_security_level ($smtpd_tls_security_level)
! The SMTP TLS security level for the postscreen(8)
! server; when a non-empty value is specified, this
overrides the obsolete parameters
postscreen_use_tls and postscreen_enforce_tls.
tlsproxy_service_name (tlsproxy)
! The name of the tlsproxy(8) service entry in mas-
ter.cf.
OBSOLETE STARTTLS SUPPORT CONTROLS
! These parameters are supported for compatibility with
smtpd(8) legacy parameters.
postscreen_use_tls ($smtpd_use_tls)
! Opportunistic TLS: announce STARTTLS support to
! SMTP clients, but do not require that clients use
TLS encryption.
postscreen_enforce_tls ($smtpd_enforce_tls)
! Mandatory TLS: announce STARTTLS support to SMTP
! clients, and require that clients use TLS encryp-
tion.
MISCELLANEOUS CONTROLS
config_directory (see 'postconf -d' output)
! The default location of the Postfix main.cf and
master.cf configuration files.
delay_logging_resolution_limit (2)
! The maximal number of digits after the decimal
point when logging sub-second delay values.
command_directory (see 'postconf -d' output)
! The location of all postfix administrative com-
mands.
max_idle (100s)
! The maximum amount of time that an idle Postfix
! daemon process waits for an incoming connection
before terminating voluntarily.
process_id (read-only)
! The process ID of a Postfix command or daemon
process.
process_name (read-only)
! The process name of a Postfix command or daemon
process.
syslog_facility (mail)
The syslog facility of Postfix logging.
syslog_name (see 'postconf -d' output)
! The mail system name that is prepended to the
! process name in syslog records, so that "smtpd"
becomes, for example, "postfix/smtpd".
SEE ALSO
--- 238,394 ----
siders in violation of the SMTP protocol.
postscreen_helo_required ($smtpd_helo_required)
! Require that a remote SMTP client sends HELO or
EHLO before commencing a MAIL transaction.
postscreen_non_smtp_command_action (drop)
! The action that postscreen(8) takes when an SMTP
! client sends non-SMTP commands as specified with
the postscreen_forbidden_commands parameter.
postscreen_non_smtp_command_enable (no)
! Enable "non-SMTP command" tests in the
postscreen(8) server.
postscreen_pipelining_action (enforce)
! The action that postscreen(8) takes when an SMTP
! client sends multiple commands instead of sending
! one command and waiting for the server to respond.
postscreen_pipelining_enable (no)
! Enable "pipelining" SMTP protocol tests in the
postscreen(8) server.
CACHE CONTROLS
postscreen_cache_cleanup_interval (12h)
! The amount of time between postscreen(8) cache
cleanup runs.
postscreen_cache_map (btree:$data_direc-
tory/postscreen_cache)
! Persistent storage for the postscreen(8) server
decisions.
postscreen_cache_retention_time (7d)
The amount of time that postscreen(8) will cache an
! expired temporary whitelist entry before it is
removed.
postscreen_bare_newline_ttl (30d)
! The amount of time that postscreen(8) will use the
result from a successful "bare newline" SMTP proto-
col test.
postscreen_dnsbl_ttl (1h)
! The amount of time that postscreen(8) will use the
result from a successful DNS blocklist test.
postscreen_greet_ttl (1d)
! The amount of time that postscreen(8) will use the
result from a successful PREGREET test.
postscreen_non_smtp_command_ttl (30d)
! The amount of time that postscreen(8) will use the
! result from a successful "non_smtp_command" SMTP
protocol test.
postscreen_pipelining_ttl (30d)
! The amount of time that postscreen(8) will use the
result from a successful "pipelining" SMTP protocol
test.
RESOURCE CONTROLS
line_length_limit (2048)
! Upon input, long lines are chopped up into pieces
! of at most this length; upon delivery, long lines
are reconstructed.
postscreen_client_connection_count_limit
($smtpd_client_connection_count_limit)
! How many simultaneous connections any client is
allowed to have with the postscreen(8) daemon.
postscreen_command_count_limit (20)
! The limit on the total number of commands per SMTP
! session for postscreen(8)'s built-in SMTP protocol
engine.
postscreen_command_time_limit (${stress?10}${stress:300}s)
! The time limit to read an entire command line with
postscreen(8)'s built-in SMTP protocol engine.
postscreen_post_queue_limit ($default_process_limit)
! The number of clients that can be waiting for ser-
vice from a real SMTP server process.
postscreen_pre_queue_limit ($default_process_limit)
! The number of non-whitelisted clients that can be
! waiting for a decision whether they will receive
service from a real SMTP server process.
postscreen_watchdog_timeout (10s)
! How much time a postscreen(8) process may take to
! respond to an SMTP client command or to perform a
cache operation before it is terminated by a built-
in watchdog timer.
STARTTLS CONTROLS
postscreen_tls_security_level ($smtpd_tls_security_level)
! The SMTP TLS security level for the postscreen(8)
! server; when a non-empty value is specified, this
overrides the obsolete parameters
postscreen_use_tls and postscreen_enforce_tls.
tlsproxy_service_name (tlsproxy)
! The name of the tlsproxy(8) service entry in mas-
ter.cf.
OBSOLETE STARTTLS SUPPORT CONTROLS
! These parameters are supported for compatibility with
smtpd(8) legacy parameters.
postscreen_use_tls ($smtpd_use_tls)
! Opportunistic TLS: announce STARTTLS support to
! SMTP clients, but do not require that clients use
TLS encryption.
postscreen_enforce_tls ($smtpd_enforce_tls)
! Mandatory TLS: announce STARTTLS support to SMTP
! clients, and require that clients use TLS encryp-
tion.
MISCELLANEOUS CONTROLS
config_directory (see 'postconf -d' output)
! The default location of the Postfix main.cf and
master.cf configuration files.
delay_logging_resolution_limit (2)
! The maximal number of digits after the decimal
point when logging sub-second delay values.
command_directory (see 'postconf -d' output)
! The location of all postfix administrative com-
mands.
max_idle (100s)
! The maximum amount of time that an idle Postfix
! daemon process waits for an incoming connection
before terminating voluntarily.
process_id (read-only)
! The process ID of a Postfix command or daemon
process.
process_name (read-only)
! The process name of a Postfix command or daemon
process.
syslog_facility (mail)
The syslog facility of Postfix logging.
syslog_name (see 'postconf -d' output)
! The mail system name that is prepended to the
! process name in syslog records, so that "smtpd"
becomes, for example, "postfix/smtpd".
SEE ALSO
***************
*** 400,413 ****
POSTSCREEN_README, Postfix Postscreen Howto
LICENSE
! The Secure Mailer license must be distributed with this
software.
HISTORY
This service was introduced with Postfix version 2.8.
! Many ideas in postscreen(8) were explored in earlier work
! by Michael Tokarev, in OpenBSD spamd, and in MailChannels
Traffic Control.
AUTHOR(S)
--- 401,414 ----
POSTSCREEN_README, Postfix Postscreen Howto
LICENSE
! The Secure Mailer license must be distributed with this
software.
HISTORY
This service was introduced with Postfix version 2.8.
! Many ideas in postscreen(8) were explored in earlier work
! by Michael Tokarev, in OpenBSD spamd, and in MailChannels
Traffic Control.
AUTHOR(S)
diff -cr --new-file /var/tmp/postfix-2.8.0/man/man8/postscreen.8 ./man/man8/postscreen.8
*** /var/tmp/postfix-2.8.0/man/man8/postscreen.8 Mon Jan 17 19:40:54 2011
--- ./man/man8/postscreen.8 Tue Feb 22 17:22:32 2011
***************
*** 64,70 ****
RFC 1985 (ETRN command)
RFC 2034 (SMTP Enhanced Status Codes)
RFC 2821 (SMTP protocol)
! RFC 2920 (SMTP Pipelining)
RFC 3207 (STARTTLS command)
RFC 3461 (SMTP DSN Extension)
RFC 3463 (Enhanced Status Codes)
--- 64,70 ----
RFC 1985 (ETRN command)
RFC 2034 (SMTP Enhanced Status Codes)
RFC 2821 (SMTP protocol)
! Not: RFC 2920 (SMTP Pipelining)
RFC 3207 (STARTTLS command)
RFC 3461 (SMTP DSN Extension)
RFC 3463 (Enhanced Status Codes)
***************
*** 82,88 ****
Support for AUTH may be added in the future.
In the mean time, if you need to make these services available
on port 25, then do not enable the optional "after 220
! server greeting" tests.
The optional "after 220 server greeting" tests involve
\fBpostscreen\fR(8)'s built-in SMTP protocol engine. When
--- 82,89 ----
Support for AUTH may be added in the future.
In the mean time, if you need to make these services available
on port 25, then do not enable the optional "after 220
! server greeting" tests, and do not use DNSBLs that reject
! traffic from dial-up and residential networks.
The optional "after 220 server greeting" tests involve
\fBpostscreen\fR(8)'s built-in SMTP protocol engine. When
diff -cr --new-file /var/tmp/postfix-2.8.0/proto/POSTSCREEN_README.html ./proto/POSTSCREEN_README.html
*** /var/tmp/postfix-2.8.0/proto/POSTSCREEN_README.html Tue Jan 18 09:16:07 2011
--- ./proto/POSTSCREEN_README.html Tue Feb 8 10:59:25 2011
***************
*** 432,444 ****
as:
! COMMAND PIPELINING after time from [address]:port!
Translation: the SMTP client at [address]:port sent multiple ! SMTP commands, instead of sending one command and then waiting for ! the server to reply. This happened time seconds after the ! "220 " server greeting was sent.
The postscreen_pipelining_action parameter specifies the action that is taken next. See "When tests fail --- 432,445 ---- as:
! COMMAND PIPELINING from [address]:port after command!
Translation: the SMTP client at [address]:port sent ! multiple SMTP commands, instead of sending one command and then ! waiting for the server to reply. This happened after the client ! sent command. Postfix 2.8 does not log the input that was ! sent too early.