https://wiki.gardiol.org/ 2026-05-02T08:39:21+00:00 https://wiki.gardiol.org/ https://wiki.gardiol.org/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2026-01-15T18:02:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:configure-admin&rev=1768500161&do=diff H) Configure PostfixAdmin PostfixAdmin uses the postfixadmin/config.local.php configuration file that you need to create. You can check postfixadmin/config.inc.php for the complete list of configuration options. You only need to redefine what you want to change. text/html 2025-07-24T13:58:52+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:configure-dkim-spf-dmarc&rev=1753365532&do=diff I) Configure proper mail delivery You need access to your domain DNS records, this is mandatory. SPF (Sender Policy Framework) SPF works both outbound and inbound SPF Outbound This is the most difficult, but critical step. You need to add to your text/html 2026-04-07T06:49:35+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:configure-dovecot&rev=1775544575&do=diff G) Configuring Dovecot Dovecot configuation is stored in /etc/dovecot. There is a master file called dovecot.conf but most of the changes need to be applied to the files under /etc/dovecot/conf.d. For each file, i will show you the changes from the defaults that you need to apply. text/html 2025-03-13T13:30:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:configure-postfix&rev=1741872614&do=diff F) Configuration: postfix Postfix is the Mail Transfer Agent, the tool that actually moves your email messages from a the sender to the destination (recipient). It speak the Simple Mail Transport Protocol (SMTP) and it has some serious responsibilities which are: text/html 2025-03-13T13:28:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:dns&rev=1741872521&do=diff A) Email related DNS records The DNS (Domain Name Service) plays a critical role in email delivery. You need to create a set of DNS records to make sure that your email can be delivered and that email can be delivered to you as well. The basic record to setup is the MX record, which tells the email servers text/html 2026-04-14T07:37:24+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:forward&rev=1776152244&do=diff Z) Forwarding Email Setup Assuming you already have a full email server (either hosted by you or you are using some third party service), you will need your internal server (the home server) to be able to send emails. This is true even if you host your email server, because as i say text/html 2026-01-15T18:03:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:install-admin&rev=1768500188&do=diff E) Installation: postfixadmin web gui PostfixAdmin is a neat web GUI that let's you monitor, create domains, accounts and much more on your web server. USE flags PostfixAdmin is a PHP application which you will be running with NGINX + PHP-FPM. Ensure your PHP has the text/html 2025-07-24T13:58:00+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:install-dkim-spf-dmarc&rev=1753365480&do=diff D) DKIM, SPF and DMARC Read this article for a general description. SPF stands for Sender Policy Framework and is an authentication protocol that lists IP addresses in a DNS TXT record that are authorized to send email on behalf of domains. DKIM stands for text/html 2025-03-13T13:29:02+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:install-preliminary&rev=1741872542&do=diff B) 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 text/html 2025-03-13T13:29:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:install-servers&rev=1741872554&do=diff C) Installation: servers Postfix is your Mail Transfer Agent, which means that Postfix role is to actually send emails from one server to the other. Postfix is the server that will let you send an email, and also the server which will receive emails for you from other email servers. text/html 2026-04-13T14:52:33+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:mailscanner&rev=1776091953&do=diff N) Spam filtering RSpamD is an advanced spam filtering system and email processing framework that allows evaluation of messages by a number of rules including regular expressions, statistical analysis and custom services such as URL black lists. Each message is analysed by Rspamd and given a verdict that might be used by MTA for further processing (e.g. to reject a message, or add a special header indicating spam) along with other information, such as possible DKIM signature or modifications su… text/html 2025-03-13T14:53:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.gardiol.org/doku.php?id=email:start&rev=1741877594&do=diff 4] E-Mail Hosting E-Mail Concepts While the e-mail is one of the most ancient internet protocols, like DNS, it has been integrated with many pieces and bit over the decades to evolve it to an usable state today. E-Mail has tons of issues, like spam, abuse and plain brute-force attacks on top of no default encryption and limited overall security. To address most of these issues over the years new protocols and standards emerged, like DKIM, SPF, DMARC and so on. The basic SMTP has been integra…