opensmtpd-filter-auth/filter-auth.8 at master · catap/opensmtpd-filter-auth · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
.\"	$OpenBSD$
.\"
.\" Copyright (c) 2024 Kirill A. Korinsky <kirill@korins.ky>>
.\" Copyright (c) 2019 Martijn van Duren <martijn@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate$
.Dt FILTER-AUTH 8
.Os
.Sh NAME
.Nm filter-auth
.Nd authenticate email and add Authentication-Results header
.Sh SYNOPSIS
.Nm
.Op Fl A
.Op Ar authserv-id
.Sh DESCRIPTION
.Nm
verifies the DKIM and ARC signatures of messages, the SPF policy and
adds an Authentication-Results header to the message. If the
.Fl A
flag is specified, it adds the ARC-Authentication-Results header
instead, with the next unused
.Em i
value in the chain. This filter gets used
.Em authserv-id
from OpenSMTPD which can be overridden by the
.Ar authserv-id
argument.
.Sh SEE ALSO
.Xr filter-admdscrub 8
.Xr filter-dkimsign 8
.Xr smtpd 8
.Sh STANDARDS
.\" RFC7208
.\" RFC8601
.Rs
.%A J. Klensin
.%D October 2008
.%R RFC 5321
.%T Simple Mail Transfer Protocol
.Re
.Pp
.Rs
.%A D. Crocker, Ed.
.%Q Brandenburg InternetWorking
.%A T. Hansen, Ed.
.%Q AT&T Laboratories
.%A M. Kucherawy, Ed.
.%Q Cloudmark
.%D September 2011
.%R RFC 6376
.%T DomainKeys Identified Mail (DKIM) Signatures
.Re
.Pp
.Rs
.%A S. Kitterman
.%Q Kitterman Technical Services
.%D April 2014
.%R RFC 7208
.%T Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1
.Re
.Pp
.Rs
.%A M. Kucherawy
.%D May 2019
.%R RFC 8601
.%T Message Header Field for Indicating Message Authentication Status
.Re
.Sh AUTHORS
.An Kirill A. Korinsky Aq Mt kirill@korins.ky
.An Martijn van Duren Aq Mt martijn@openbsd.org
.An Gilles Chehade Aq Mt gilles@poolp.org