amavisd-milter(8)

1amavisd-milter(8)           System Manager’s Manual          amavisd-milter(8)
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NAME

6       amavisd-milter - sendmail milter for amavis
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SYNOPSIS

9       amavisd-milter  [-Bfhv] [-d debug-level] [-D delivery-care-of] [-m max-
10       conns]  [-M max-wait]  [-p pidfile]   [-P]   [-q backlog]   [-s socket]
11       [-t timeout] [-S socket] [-T timeout] [-w directory]
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DESCRIPTION

14       The  amavisd-milter is a sendmail milter (mail filter) for amavis 2.4.3
15       and above and sendmail 8.13 and above.
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17       With the amavisd-milter, a full amavis functionality is available,  in‐
18       cluding  adding spam and virus information header fields, modifying the
19       Subject, adding address extensions and removing certain recipients from
20       delivery, while delivering the same message to the rest.
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22       For more information you can visit amavisd-milter website:
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24              https://github.com/prehor/amavisd-milter
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26   Options
27       The options are as follows:
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29       -B     Uses the milter macro {daemon_name} as the policy bank name (see
30              POLICY BANKS below).
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32       -d debug-level
33              Set the debug level.  The debugging traces become more  detailed
34              as the debug level increases.  Maximum is 9.
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36       -D delivery-care-of
37              Set  AM.PDP  request  attribute  delivery_care_of to client (de‐
38              fault) or server.
39
40       When the client method is used, then amavisd-milter is responsible  for
41       forwarding  the  message to the recipients.  This method does not allow
42       personalized header or body modification.
43
44       When the server method is used, then amavis is responsible for forward‐
45       ing  the  message to the recipients and may personalize the headers and
46       the body of the messages.   $forward_method  variable  in  amavisd.conf
47       must  point  to  a  place willing to accept the message without further
48       checking in amavis.
49
50       -f     Run amavisd-milter in the foreground  (i.e. do  not  daemonize).
51              Print debugging messages to the terminal.
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53       -h     Print the help page and exit.
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55       -m max-conns
56              Maximum  concurrent  amavis  connections  (default 0 = unlimited
57              number of connections).  It must be the same as the $max_servers
58              variable in amavisd.conf.
59
60       -M timeout
61              Timeout for message processing in seconds (default 300 seconds =
62              5 minutes).  Must be less then timeout for a response to the fi‐
63              nal “.” that terminates a message on sending MTA.  Sendmail uses
64              default value 1 hour, postfix 10 minutes and qmail  20  minutes.
65              Recommended value is less than 10 minutes.
66
67       If  you use other milters (especially time-consuming), the timeout must
68       be sufficient to process message in all milters.
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70       -p pidfile
71              Use this pid file.
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73       -P     When the amavis  fails,  the  message  will  be  passed  through
74              unchecked.
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76       -q backlog
77              Sets  the  incoming  socket backlog used by listen(2).  If it is
78              not set or set to zero, the operating system default is used.
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80       -s socket
81              Communication socket between sendmail and  amavisd-milter.   The
82              protocol  spoken  over  this socket is MILTER (Mail FILTER).  It
83              must have the same vale as the INPUT_MAIL_FILTER macro in  send‐
84              mail.mc.
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86       The socket must be in format proto:address:
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88              • {unix|local}:/path/to/file - A named pipe.
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90              • inet:port@{hostname|ip-address} - An IPV4 socket.
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92              • inet6:port@{hostname|ip-address} - An IPV6 socket.
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94       -S socket
95              Communication  socket  between  amavisd-milter  and amavis.  The
96              protocol spoken over this socket is AM.PDP (AMavis Policy  Dele‐
97              gation   Protocol).    It  must  have  the  same  value  as  the
98              $unix_socketname variable in amavisd.conf.
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100       The socket must be in format proto:address:
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102              • {unix|local}:/path/to/file - A named pipe.
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104              • inet:port@{hostname|ip-address} - An IPV4 socket.
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106              • inet6:port@{hostname|ip-address} - An IPV6 socket.
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108       -t timeout
109              Sendmail connection timeout in seconds (default 600  =  10  min‐
110              utes).   It  must  have  the  same vale as the INPUT_MAIL_FILTER
111              macro in sendmail.mc and must be greater than or  equal  to  the
112              amavis connection timeout.
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114       If  you use other milters (especially time-consuming), the timeout must
115       be sufficient to process message in all milters.
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117       -T timeout
118              Amavis connection timeout in seconds (default 600 = 10 minutes).
119              Must be sufficient to process message in amavis.  Usually, it is
120              a good idea to set them to the same value as sendmail connection
121              timeout.
122
123       -v     Report the version number and exit.
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125       -w directory
126              Set working directory.
127

POLICY BANKS

129       If  the option -B is enabled, amavisd-milter uses the value of the mil‐
130       ter macro {daemon_name} as the name of the amavis policy bank.   Usual‐
131       ly, this milter macro is set to name of the MTA.
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133       When remote client is authenticated, amavisd-milter uses authentication
134       information as the name of the amavis policy banks:
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136       SMTP_AUTH
137              Remote client has been authenticated.
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139       SMTP_AUTH_<MECH>
140              The remote client authentication mechanism.
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142       SMTP_AUTH_<MECH>_<BITS>
143              The number of bits used for the key of the symmetric cipher when
144              authentication mechanism uses it.
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EXAMPLES

147   Configuring amavis
148       In the amavisd.conf file set protocol and amavis socket to:
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150              $protocol = "AM.PDP";                      # Use AM.PDP protocol
151              $unix_socketname = "$MYHOME/amavisd.sock"; # Listen on Unix socket
152              ### $inet_socket_port = 10024;             # Do not listen on TCP port
153
154       Then (re)start the amavisd daemon.
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156   Configuring Postfix
157       Add the following entries to Postfix main.cf*:
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159              smtpd_milters = local:<AMAVISD_MILTER.SOCK>
160              milter_connect_macros = j {client_name} {daemon_name} v
161              milter_protocol = 6
162
163       Then (re)start the Postfix daemon.
164
165   Configuring sendmail
166       Add the following entries to file sendmail.mc:
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168              define(`confMILTER_MACROS_CONNECT',
169                confMILTER_MACROS_CONNECT`, {client_resolve}')
170              define(`confMILTER_MACROS_ENVFROM',
171                confMILTER_MACROS_ENVFROM`, r, b')
172              INPUT_MAIL_FILTER(`amavisd-milter',
173                `S=local:<AMAVISD_MILTER.SOCK>, F=T, T=S:10m;R:10m;E:10m')
174
175       Then  rebuild  sendmail.cf  file, install it and (re)start the sendmail
176       daemon.
177
178   Running amavisd-milter
179       This examples assumes that amavis is running as user vscan.  The actual
180       name is shown in the $daemon_user variable in amavisd.conf.
181
182   Limiting maximum concurrent connections to amavisd
183       To limit the maximum concurrent connections to amavis, run amavisd-mil‐
184       ter with this options:
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186              su - vscan -c "amavisd-milter -m 4"
187
188   Troubleshooting
189       For troubleshooting, run amavisd-milter on the foreground and  set  the
190       debug level to the appropriate value:
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192              su - vscan -c "amavisd-milter -f -d 4"
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194       Debug levels are:
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196       • 1 - Not errors but unexpected states (connection abort etc).
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198       • 2 - Main states in message processing.
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200       • 3 - All amavisd-milter debug messages.
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202       • 4-9 - Milter communication debugging (set smfi_setdbg to 1-6).
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AUTHORS

212       This  manual page was written by Petr Rehor and is based on Jerzy Sakol
213       initial work.
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BUGS

216       Issues can be reported by using GitHub at:
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218              https://github.com/prehor/amavisd-milter/issues
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220       Full detailed information on how to report issues, please see the  Con‐
221       tribution Guidelines at:
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223              https://github.com/prehor/amavisd-milter/blob/master/CONTRIBUT‐
224              ING.md
225
226       Enhancements, requests and problem reports are welcome.
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228       If you run into problems, first check the GitHub issues before creating
229       a  new  one.   It  is very likely that someone has encountered the same
230       problem and it has already been solved.
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234Version 1.7.2                                                amavisd-milter(8)