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Postfix cannot do what qmail can do. Specifically, users can create and destroy email addresses themselves with .qmail files. This is different and more power

Postfix cannot do what qmail can do. Specifically, users can create and destroy email addresses themselves with .qmail files. This is different and more powerful than Google's plus-addressing approach. There are many, many other features of qmail's implementation that Postfix cannot compete with. Postfix is not alone in this; no other MTA/MDA can do what qmail can do.

pmoriarty 7y ago
It would be really useful to have an exhaustive list of all these things that qmail can do that other MTA's can't.
- pilif 7y ago
  it would be a very small list. However, the exhaustive list of things other MTAs can do that qmail can't would be huge (starting with backscatter-proof bounces for example) qmail was limited back in the 90ies and it's horribly behind the times now.
amaccuish 7y ago
I've got a similar thing with my postfix setup though. My users can go to their account portal and apply for an alias, which when approved (to avoid taking of important names like postmaster etc.) is added to their otherMailboxes LDAP attribute. They can delete the alias themselves when they're done with it. I'm tempted to start auto-allowing new aliases and just having a list of names that can't be used (postmaster, webmaster) etc, that some services use for domain ownership verification. As an aside I do hope qmail offers similar limiting abilities. It wouldn't be great if a user could make themselves receive webmaster@domain.tld emails!
- schmonz 7y ago
  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 simple and powerful.
  - 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?
Tepix 7y ago
The standard postfix setup these days uses a DB backend and users can edit the database to create new email addresses and aliases.

pmoriarty 7y ago

It would be really useful to have an exhaustive list of all these things that qmail can do that other MTA's can't.

pilif 7y ago
it would be a very small list. However, the exhaustive list of things other MTAs can do that qmail can't would be huge (starting with backscatter-proof bounces for example) qmail was limited back in the 90ies and it's horribly behind the times now.

amaccuish 7y ago

I've got a similar thing with my postfix setup though. My users can go to their account portal and apply for an alias, which when approved (to avoid taking of important names like postmaster etc.) is added to their otherMailboxes LDAP attribute. They can delete the alias themselves when they're done with it. I'm tempted to start auto-allowing new aliases and just having a list of names that can't be used (postmaster, webmaster) etc, that some services use for domain ownership verification. As an aside I do hope qmail offers similar limiting abilities. It wouldn't be great if a user could make themselves receive webmaster@domain.tld emails!

schmonz 7y ago
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 simple and powerful.
- 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?

Tepix 7y ago

The standard postfix setup these days uses a DB backend and users can edit the database to create new email addresses and aliases.