Postfix Overview - Introduction - SCN Research
Postfix Overview - Introduction - SCN Research
Postfix Overview - Introduction - SCN Research
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<strong>Postfix</strong> Configuration - UCE Controls<br />
clients send HELO greetings in this manner.<br />
Page 4 of 10<br />
reject_unknown_hostname<br />
Reject the request when the hostname in the client HELO (EHLO) command has no DNS A<br />
or MX record. The unknown_hostname_reject_code specifies the response code to rejected<br />
requests (default: 450).<br />
reject_non_fqdn_hostname<br />
Reject the request when the hostname in the client HELO (EHLO) command is not in fullyqualified<br />
domain form, as required by the RFC. The non_fqdn_reject_code specifies the response<br />
code to rejected requests (default: 504).<br />
check_helo_access maptype:mapname<br />
maptype:mapname<br />
Search the named access database for the HELO hostname or parent domains in the<br />
specified table. Reject the request if the result is REJECT or "[45]XX text". Permit the request<br />
when the result is OK or RELAY or all-numerical. Otherwise, treat the result as another list of<br />
UCE restrictions. The access_map_reject_code parameter specifies the response code for<br />
REJECT results (default: 554).<br />
reject_maps_rbl<br />
reject_unknown_client<br />
permit_mynetworks<br />
check_client_access maptype:mapname<br />
See client hostname/address restrictions.<br />
permit<br />
reject<br />
reject_unauth_pipelining<br />
See generic restrictions.<br />
Require strict RFC 821-style envelope addresses<br />
The strict_rfc821_envelopes parameter controls how tolerant <strong>Postfix</strong> is with respect to addresses given in<br />
MAIL FROM or RCPT TO commands. Unfortunately, the widely-used Sendmail program tolerates lots of nonstandard<br />
behavior, so a lot of software expects to get away with it. Being strict to the RFC not only stops<br />
unwanted mail, it also blocks legitimate mail from poorly-written mail applications.<br />
Default:<br />
strict_rfc821_envelopes = no<br />
By default, the <strong>Postfix</strong> SMTP server accepts any address form that it can make sense of, including<br />
address forms that contain RFC 822-style comments, or addresses not enclosed in . There is a lot of<br />
broken or misconfigured software out there on the Internet.<br />
Example:<br />
strict_rfc821_envelopes = yes<br />
Sender address restrictions<br />
The smtpd_sender_restrictions parameter restricts what sender addresses this system accepts in MAIL FROM<br />
http://www.porcupine.org/postfix-mirror/uce.html<br />
6/26/01
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