With forwarding, you can only receive e-mail sent to one address on multiple e-mail addresses.This way, you can have multiple owners of one e-mail address.With aliases, you can send e-mail from AND receive e-mail on multiple e-mail addresses which are linked to the same inbox.The setup also offers some convenient additional functionality such as: E.g.: or This allows you to easily define mailbox filters for different kinds of e-mail, for example, to automatically sort incoming newsletters into a newsletter folder instead of your inbox. “Address tagging”, adding tags to existing e-mail addresses using the + sign.It sets up a global spam filter, which uses self-learning from e-mails in all mailboxes.TLS will be promoted in communications between other servers. To check for MTA-STS policies, we make use of the Postfix MTA-STS Resolver.MTA-STS, both for receiving as well as sending e-mail.DANE SMTP server validation, both for receiving as well as sending e-mail.It supports many modern e-mail standards such as: Postfix needs to be able to do DNS lookups through a DNS recursor which supports DNSSEC.Required because Rspamd makes many DNS lookup requests when filtering e-mail.Unbound validating, recursive and caching DNS resolver.Serves as a HTTP server for autoconfiguration files.Provides us with SSL certificates from Letsencrypt.Functions as our database for domain names and users for which we accept e-mail.Scores e-mails in order to decide whether e-mails are “ham” or “spam”.Provides ways to filter e-mails and perform automated actions.Enables us to store and sync e-mail across devices.It is also fully compatible with Debian 11 “Bullseye” using the following software packages: It shows how to set up a modern mail server capable of handling e-mail for multiple domains on Debian 12 “Bookworm”. In this post my notes on how I generally approach this are described. Since around 2010 I have been running mail servers for myself and other organisations.
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