this post was submitted on 23 May 2026
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No Stupid Questions

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As in this picture, l don't want to remain a sender/recipient, but an address in itself. So that l can house multiple senders/recipients.

Would that be possible ?

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[โ€“] bleustenns@lemmy.ml 1 points 18 hours ago (1 children)

What do you mean by, "...a lot of the things you don't know yet will get you into big trouble..."?

[โ€“] cybervegan@lemmy.world 2 points 2 hours ago

The list is immense, and I didn't want to clutter my post with all the details. So just listing off things that spring to mind (because I don't know what OP doesn't know):

  • Choosing an MTA - sendmail, postfix, exim, etc. and why you might choose one over the others
  • Firewall settings
  • Software/package management on your chosen distro
  • Learning about DNS:
    • Host it - yourself via BIND
    • Or via a DNS service provider
    • DNS record types
      • Domains
      • Subdomains
      • A records/CNAMEs
      • MX records
      • Mail authority records - SPF's
      • Mail encryption records - DKIM
  • Spam filtering, anti-virus
  • Learning how to configure your MTA, which requires learning:
    • the configuration file language your MTA uses
    • what all the options mean and what they do
    • what the bare minimum options are to get up and running
    • how to make sure your configuration is secure and won't be exploitable by bad actors
    • how mail really gets delivered
    • how to setup secure smtp
    • how to set up SPFs
    • troubleshooting why GMAIL or Microsoft won't accept your mail
    • troubleshooting why GMAIL or Microsoft have stopped accepting your mail
    • dealing with blacklists/greylists when someone sends too many messages, or something that "looks too spammy"
  • Mail hosting pitfalls
    • Being an open relay
    • Rate limiting
    • Reputation management
    • Vulnerabilities that let a hacker take over your server
    • Resource management - disk, memory, processes, queues, etc.
    • Downtime when you need to do updates
    • Downtime if you change your DNS configuration

I've definitely missed some stuff, and each of those things requires knowing other stuff too, so you can see that it's really a pretty deep subject. This is precisely why not many people self-host email themselves these days - the big guys have made it harder and harder to do so, in the name of eradicating spam, which they themselves are the biggest vectors for.