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Wiki source code of Postfix configuration

Version 1.1 by Alexandru Pentilescu on 2026/02/08 14:29
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Alexandru Pentilescu 1.1 1 (% class="jumbotron" %)
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5 = VPS =
6 This will document my existing postfix installation. This is a mail server that I'm using to relay email notifications from my various docker containers to external email addresses owned by me or other people.
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14 = Main configuration =
15
16 The following is the configuration of the /etc/postfix/main.cf file.
17
18 {{code language="INI"}}
19 # See /usr/share/postfix/main.cf.dist for a commented, more complete version
20
21
22 # Debian specific: Specifying a file name will cause the first
23 # line of that file to be used as the name. The Debian default
24 # is /etc/mailname.
25 #myorigin = /etc/mailname
26
27 smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
28 biff = no
29
30 # appending .domain is the MUA's job.
31 append_dot_mydomain = no
32
33 # Uncomment the next line to generate "delayed mail" warnings
34 #delay_warning_time = 4h
35
36 readme_directory = no
37
38 # See http://www.postfix.org/COMPATIBILITY_README.html -- default to 3.6 on
39 # fresh installs.
40 compatibility_level = 3.6
41
42
43
44 # TLS parameters
45 smtpd_tls_cert_file=/etc/letsencrypt/live/transistor.one/fullchain.pem
46 smtpd_tls_key_file=/etc/letsencrypt/live/transistor.one/privkey.pem
47 smtpd_tls_security_level=may
48
49 smtp_tls_CApath=/etc/ssl/certs
50 smtp_tls_security_level=may
51 smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
52
53
54 smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
55 myhostname = mail.transistor.one
56 alias_maps = hash:/etc/aliases
57 alias_database = hash:/etc/aliases
58 myorigin = /etc/mailname
59 mydestination = $myhostname, transistor.one, localhost.one, localhost
60 relayhost =
61 mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 172.16.0.0/12
62 mailbox_size_limit = 0
63 recipient_delimiter = +
64 inet_interfaces = all
65 inet_protocols = all
66
67 {{/code}}
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69
70
71 == Sub-paragraph ==
72
73 Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
74
75 == Sub-paragraph ==
76
77 Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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79 === Sub-sub paragraph ===
80
81 Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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83
84 = Paragraph 2 =
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86 Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
87
88 == Sub-paragraph ==
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90 Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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92 == Sub-paragraph ==
93
94 Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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100 {{box title="**Contents**"}}{{toc /}}{{/box}}
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102 [[image:Templates.Article.Template.WebHome@image1.jpg||style="width: 100%"]]
103 //Figure 1: [[Sea>>https://commons.wikimedia.org/wiki/File:Isle_of_Icacos_II.jpg]]//
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105 [[image:Templates.Article.Template.WebHome@image2.jpg||style="width: 100%"]]
106 //Figure 2: [[Waves>>https://commons.wikimedia.org/wiki/File:Culebra_-_Playa_de_Flamenco.jpg]]//
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