man spfquery.libspf2 (1): checks if an IP address is an SPF-authorized SMTP sender for a domain.

Other Alias

spfquery

SYNOPSIS

spfquery {-i|--ip} ip-address {-s|--sender} [local-part@]domain [{-h|--helo} domain-name] [--rcpt-to email-address(es)] [CONTROL-OPTIONS]
spfquery {-f|--file} datafile [CONTROL-OPTIONS]
spfquery {--help|-v|--version}

DESCRIPTION

This manual page documents briefly the spfquery command. It was written for the Debian® distribution because the original program does not have a manual page.

spfquery performs Sender Policy Framework (SPF) authorization checks based on the command-line arguments or data given in a file or on standard input. For information on SPF see http://www.openspf.org.

OPTIONS

Options are divided into two groups: Data options, which must be given, though just enough of them to specify a query; and control options, which are optional and control the local policy, behaviour and output format of spfquery.

This programs follows the GNU getopt_long_only(3) command line syntax: Long options can be given with one or two dashes and can be abbreviated to a prefix long enough to be non-ambiguous. If an option starting with a single dash doesn't match a long option, it is taken as a short option with a following parameter, if applicable. An equals sign between the option name and the parameter is optional for both short and long options.

Data options

The --file option conflicts with all the other data options. The --helo and --rcpt-to are optional.

-f, --file filename

Read SPF data from filename. Specify "-" to read from standard input.

The file should consist of one line per query, each query line consisting of the IP address, sender adress, and optional HELO string, separated by spaces.

Note Local parts containing spaces are currently not supported.

-i, --ip ip-address

Specify the IP address of the remote host that is delivering the mail.

-s, --sender [local-part@]domain

Specify the email address that was used as the envelope sender. If no username (local part) is given, "postmaster" will be assumed.

-h, --helo domain-name

Specify that domain-name was provided in the SMTP HELO (or EHLO) command.

-r, --rcpt-to rcpt-address[,rcpt-address,...]

Specify the recipients as comma-separated list. Any secondary mail exchangers of all recipient domains are automatically authorized.

Control options

-d, --debug[=level]: Turn on debugging output.
-l, --local spf-terms: Test against spf-terms before the final (implicit or explicit) "all" in an SPF record. This can be used to implement a local policy for whitelisting.
-t, --trusted [1]: Check the sender domain with trusted-forwarder.org. This is a non-standard feature.
-t 0, --trusted 0: Do not check the sender domain with trusted-forwarder.org. This is the default.
-g, --guess spf-mechanisms: Test the sender domain against spf-mechanisms if the domain has no SPF record.
-e, --default-explanation string: Default explanation string to use if the SPF record does not specify an explanation string itself.
-m, --max-lookup number: Maximum number of DNS lookups to allow.
-c, --sanitize [0|1]: Do [not] sanitize the output by condensing consecutive whitespace into a single space and replacing non-printable characters with question marks. Enabled by default.
-n, --name hostname: Use hostname as the name of the local system instead of "spfquery" (the name is used in the output).
-k, --keep-comments: Print comments found when reading from a file.
-a, --override ...
-z, --fallback ...: Provide override and fallback SPF records for certain domains. Not implemented yet. spfquery would act as if the specified records were present before and after any existing record, respectively, of those domains.
--help: Show summary of options.
-v, --version: Show version of program.

DIAGNOSTICS

The output ordinarily consists of four lines:

1.: the result code;
2.: the explanation, suitable for use in an SMTP response message, empty except when a rejection (permanent or temporary) makes sense;
3.: the header comment on its own;
4.: the Received-SPF header field as defined in RFC 4408 section 7, incorporating the header comment.

If errors (including no SPF record found!) occur during processing, one or more error blocks will be prepended. These start with "StartError" and end with "EndError".

The result codes and their corresponding exit codes are as follows:

1 - neutral: The sender domain explicitly makes no assertion about the ip-address. This result must be interpreted exactly as if no SPF record at all existed.
2 - pass: The ip-address is authorized to send mail for the sender domain.
3 - fail: The ip-address is unauthorized to send mail for the sender domain.
4 - softfail: The ip-address is not authorized to send mail for the sender domain, but the sender domain cannot or does not wish to make a strong assertion that no such mail can ever come from it.
5 - none: No SPF record was found.
6 - error (temporary): A transient error occurred (e.g. failure to reach a DNS server), preventing a result from being reached.
7 - unknown (permanent error): One or more SPF records could not be interpreted.

EXAMPLES

spfquery -ip=11.22.33.44 [email protected] -helo=spammer.tld
spfquery -f test_data
echo "127.0.0.1 [email protected] helohost.com" | spfquery -f -

AUTHOR

spfquery was written by Wayne Schlitt.

This manual page was written by Magnus Holmgren for the Debian® system (but may be used by others). Heavily inspired by the spfquery manpage of libmail-spf-query-perl (spfquery.mail-spf-query-perl(1)) by Julian Mehnle. Also based on the command-line help of spfquery.