Commit | Line | Data |
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1 | .TH qmail-smtpd 8 |
2 | .SH NAME | |
3 | qmail-smtpd \- receive mail via SMTP | |
4 | .SH SYNOPSIS | |
5 | .B qmail-smtpd | |
6 | .SH DESCRIPTION | |
7 | .B qmail-smtpd | |
8 | receives mail messages via the Simple Mail Transfer Protocol (SMTP) | |
9 | and invokes | |
10 | .B qmail-queue | |
11 | to deposit them into the outgoing queue. | |
12 | .B qmail-smtpd | |
13 | must be supplied several environment variables; | |
14 | see | |
15 | .BR tcp-environ(5) . | |
16 | ||
17 | .B qmail-smtpd | |
18 | is responsible for counting hops. | |
19 | It rejects any message with 100 or more | |
20 | .B Received | |
21 | or | |
22 | .B Delivered-To | |
23 | header fields. | |
24 | ||
25 | .B qmail-smtpd | |
26 | supports ESMTP, including the 8BITMIME and PIPELINING options. | |
27 | .SH TRANSPARENCY | |
28 | .B qmail-smtpd | |
29 | converts the SMTP newline convention into the UNIX newline convention | |
30 | by converting CR LF into LF. | |
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31 | It returns a temporary error and drops the connection on bare LFs; |
32 | see | |
33 | .BR http://pobox.com/~djb/docs/smtplf.html . | |
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34 | |
35 | .B qmail-smtpd | |
36 | accepts messages that contain long lines or non-ASCII characters, | |
37 | even though such messages violate the SMTP protocol. | |
38 | .SH "CONTROL FILES" | |
39 | .TP 5 | |
40 | .I badmailfrom | |
41 | Unacceptable envelope sender addresses. | |
42 | .B qmail-smtpd | |
43 | will reject every recipient address for a message | |
44 | if the envelope sender address is listed in | |
45 | .IR badmailfrom . | |
46 | A line in | |
47 | .I badmailfrom | |
48 | may be of the form | |
49 | .BR @\fIhost , | |
50 | meaning every address at | |
51 | .IR host . | |
52 | .TP 5 | |
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53 | .I databytes |
54 | Maximum number of bytes allowed in a message, | |
55 | or 0 for no limit. | |
56 | Default: 0. | |
57 | If a message exceeds this limit, | |
58 | .B qmail-smtpd | |
59 | returns a permanent error code to the client; | |
60 | in contrast, if | |
61 | the disk is full or | |
62 | .B qmail-smtpd | |
63 | hits a resource limit, | |
64 | .B qmail-smtpd | |
65 | returns a temporary error code. | |
66 | ||
67 | .I databytes | |
68 | counts bytes as stored on disk, not as transmitted through the network. | |
69 | It does not count the | |
70 | .B qmail-smtpd | |
71 | Received line, the | |
72 | .B qmail-queue | |
73 | Received line, or the envelope. | |
74 | ||
75 | If the environment variable | |
76 | .B DATABYTES | |
77 | is set, it overrides | |
78 | .IR databytes . | |
79 | .TP 5 | |
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80 | .I localiphost |
81 | Replacement host name for local IP addresses. | |
82 | Default: | |
83 | .IR me , | |
84 | if that is supplied. | |
85 | .B qmail-smtpd | |
86 | is responsible for recognizing dotted-decimal addresses for the | |
87 | current host. | |
88 | When it sees a recipient address of the form | |
89 | .IR box@[d.d.d.d] , | |
90 | where | |
91 | .I d.d.d.d | |
92 | is a local IP address, | |
93 | it replaces | |
94 | .IR [d.d.d.d] | |
95 | with | |
96 | .IR localiphost . | |
97 | This is done before | |
98 | .IR rcpthosts . | |
99 | .TP 5 | |
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100 | .I morercpthosts |
101 | Extra allowed RCPT domains. | |
102 | If | |
103 | .I rcpthosts | |
104 | and | |
105 | .I morercpthosts | |
106 | both exist, | |
107 | .I morercpthosts | |
108 | is effectively appended to | |
109 | .IR rcpthosts . | |
110 | ||
111 | You must run | |
112 | .B qmail-newmrh | |
113 | whenever | |
114 | .I morercpthosts | |
115 | changes. | |
116 | ||
117 | Rule of thumb for large sites: | |
118 | Put your 50 most commonly used domains into | |
119 | .IR rcpthosts , | |
120 | and the rest into | |
121 | .IR morercpthosts . | |
122 | .TP 5 | |
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123 | .I rcpthosts |
124 | Allowed RCPT domains. | |
125 | If | |
126 | .I rcpthosts | |
127 | is supplied, | |
128 | .B qmail-smtpd | |
129 | will reject | |
130 | any envelope recipient address with a domain not listed in | |
131 | .IR rcpthosts . | |
132 | ||
133 | Exception: | |
134 | If the environment variable | |
135 | .B RELAYCLIENT | |
136 | is set, | |
137 | .B qmail-smtpd | |
138 | will ignore | |
139 | .IR rcpthosts , | |
140 | and will append the value of | |
141 | .B RELAYCLIENT | |
142 | to each incoming recipient address. | |
143 | ||
144 | .I rcpthosts | |
145 | may include wildcards: | |
146 | ||
147 | .EX | |
148 | heaven.af.mil | |
149 | .heaven.af.mil | |
150 | .EE | |
151 | ||
152 | Envelope recipient addresses without @ signs are | |
153 | always allowed through. | |
154 | .TP 5 | |
155 | .I smtpgreeting | |
156 | SMTP greeting message. | |
157 | Default: | |
158 | .IR me , | |
159 | if that is supplied; | |
160 | otherwise | |
161 | .B qmail-smtpd | |
162 | will refuse to run. | |
163 | The first word of | |
164 | .I smtpgreeting | |
165 | should be the current host's name. | |
166 | .TP 5 | |
167 | .I timeoutsmtpd | |
168 | Number of seconds | |
169 | .B qmail-smtpd | |
170 | will wait for each new buffer of data from the remote SMTP client. | |
171 | Default: 1200. | |
172 | .SH "SEE ALSO" | |
173 | tcp-env(1), | |
174 | tcp-environ(5), | |
175 | qmail-control(5), | |
176 | qmail-inject(8), | |
212b6f5d | 177 | qmail-newmrh(8), |
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178 | qmail-queue(8), |
179 | qmail-remote(8) |