Postfix Overview - Introduction - SCN Research

Page 3 of 5
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.
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.
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.
http://www.porcupine.org/postfix-mirror/smtpd.8.html
6/26/01