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--- email:hosting [2025/03/02 18:09] – willy
+++ email:hosting [2025/03/03 06:57] (current) – removed willy
@@ Line 1: / Line 1: @@
-====== E-Mail server hosting ======
-Everything in the following page is directly taken (and adjusted to my liking) from [[https://wiki.gentoo.org/wiki/Complete_Virtual_Mail_Server|The Gentoo Virtual Mail Server guide]] which is a deep and very detailed read on the topic. I will stray a little bit from that guide.
-===== Architecture =====
-I will show you how to install and interconnect:
-  * [[https://www.postfix.org/|Postfix]], the MTA (Mail Transfer Agent)
-  * [[https://www.dovecot.org/|Dovecot]], the IMAP server
-  * NGINX + PHP-FPM for web access (admin console + webmail)
-  * [[https://github.com/postfixadmin/postfixadmin|PostfixAdmin]], the email configuration WEB gui
-  * Roundcube
-  * OpenDKIM
-  * OpenDMARC
-  * Spamassassin
-===== Installation: servers =====
-Install Postfix and Dovecot
-USE flags:
-<code bash>
-echo "*/* maildir dovecot sasl" >> /etc/portage/package.use/mailserver
-echo "net-mail/dovecot managesieve sqlite lz4" >> /etc/portage/package.use/mailserver
-echo "mail-mta/postfix dovecot-sasl sqlite -sasl" >> /etc/portage/package.use/mailserver
-</code>
-Emerge the servers:
-<code bash>
-emerge -vp postfix dovecot
-</code>
-===== Installation: user, permissions & storage =====
-Since different pieces of the email infrastructure will need to interoperate, it is a good idea to create a specific user to store all the emails on the filesystem. This user will own the email storage folders which i assume will be located under **/home/vmail**. I choose UID and GID 5000 since the ones <1000 are reserved for system users:
-<code bash>
-groupadd -g 5000 vmail
-useradd -m -d /home/vmail -s /bin/false -u 5000 -g vmail vmail
-chmod 2770 /home/vmail/
-</code>
-The resulting permissions should look like:
-<code bash>
-ls -ld /home/vmail
-drwxrws--- 3 vmail vmail 4096 Aug 2 07:24 /home/vmail
-</code>
-Now create the database:
-<code bash>
-su - vmail
-mkdir db
-sqlite3 db/vmail.sqlite3
-sqlite> .databases
-main: /home/vmail/db/vmail.sqlite3 r/w
-sqlite> .tables
-sqlite> .exit
-</code>
-===== Installation: DKIM, SPF and DKIM =====
-This step is **mandatory** and critical for proper email delivery.
-===== Installation: Antispam =====
-Install spamassassin & amavisd-new
-===== Installation: web GUIs =====
-postfixadmin and roundcube will be installed manually and not via Gentoo portage, to avoid upgrade issues.
-Download latest release of **postfixadmin** from [[https://github.com/postfixadmin/postfixadmin/releases|here]] and decompress in a folder accessible to the **web** user, since i use the **web** user to run all PHP based software on the external webserver:
-<code bash>
-su - web
-mkdir postfixadmin
-wget https://github.com/postfixadmin/postfixadmin/archive/refs/tags/postfixadmin-3.3.15.tar.gz
-tar xvf postfixadmin-3.3.15.tar.gz
-mv postfixadmin-postfixadmin-3.3.15 postfixadmin
-</code>
-Now, configure it by creating a file called **postfixadmin/config.local.php** with the following content (see postfixadmin/config.inc.php for all available stuff to configure):
-<file - config.local.php>
-<?php
-$CONF['database_type'] = 'sqlite';
-$CONF['database_name'] = '/home/vmail/db/vmail.sqlite3';
-$CONF['encrypt'] = 'dovecot:SHA512';
-$CONF['postfix_admin_url'] = 'https://mail.mydomain.com';
-$CONF['admin_email'] = 'postmaster@mydomain.com';
-$CONF['default_aliases'] = array (
-    'abuse' => 'abuse@mydomain.com',
-    'hostmaster' => 'hostmaster@mydomain.com',
-    'postmaster' => 'postmaster@mydomain.com',
-    'webmaster' => 'webmaster@mydomain.com'
-);
-$CONF['transport'] = 'YES';
-$CONF['configured'] = true;
-/* vim: set expandtab softtabstop=4 tabstop=4 shiftwidth=4: */
-</file>
-===== Configuration: database =====
-===== Configuration: servers =====
-FILE /etc/postfix/main.cf Binding UID and GID's to postfix
-<code>
-# Link the mailbox uid and gid to postfix.
-virtual_uid_maps = static:5000
-virtual_gid_maps = static:5000
-# Set the base address for all virtual mailboxes
-virtual_mailbox_base = /var/vmail
-</code>

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