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They can’t, unless qmail has been configured to know they control mail for domain.tld. The admin configuration mechanism for this (control/virtualdomains) is si

• amaccuish 7y ago
  Sorry I'm confused. If your mail server is setup for control of a domain (e.g. domain.tld), then what stops someone from putting postmaster@domain.tld in this .qmail file?
  • schmonz 7y ago
    People can put whatever they want in their own .qmail files. That doesn't affect anything unless qmail believes those .qmail files are relevant to what it's delivering. A user controls .qmail files for a domain if and only if an admin has configured qmail to delegate that domain to that user.
    • amaccuish 7y ago
      Ahh I see. So it's a per domain thing, and you can't restrict more granularly. That's a shame.
      • schmonz 7y ago
        I haven't experienced a need for more granular restrictions. Can you give an example of a problem it would solve?