Address aliases support about maddy HOT 10 CLOSED

LGTM

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Postfix can read these out of a database, it would be really nice if Maddy could as well.

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Generic solution - rewrite operation

Single address rewrite defined directly in configuration

rewrite [email protected] [email protected]

Generic form:

rewrite <initial address> [new address...]

This will replace a single address with multiple:

rewrite [email protected] [email protected] [email protected]

Rewrites are applied only once, so the directive above will not loop forever.

Regexp can be used in "Initial address" by wrapping it with /:

rewrite /(postmaster|admin)(@emersion\.fr)?/ [email protected]

Aliases mappings

More advanced rewriting (including mappings from files) is done using generic filter interface:

filter alias_map /etc/maddy/aliases 

We define a singleton module alias_map that performs rewriting using postfix's aliases file.

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This is a REQUIRED feature and I NEED it to be a thing. Please don't assign this task to me. I just really require this.

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Will this work in reverse, rewriting the From field in sent emails?

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No.

from maddy.

Will accounts that match the new address in rewrite argument be allowed to send as the new address email?

from maddy.

At least, for now, we don't plan to add any checks regarding whether either From header or MAIL FROM matches actual sender account. So, technically, yes.

from maddy.

I guess something like that could work for database-based rewrites.

filter alias_sql {
  driver ...
  dsn ...

  query "SELECT target FROM aliases WHERE username = %u"
}

A user-specified query should return a single string column containing new addresses, multiple rows are allowed, obviously. If the query fails for whatever reason (including zero rows result) - no rewrite it done.

from maddy.

Apparently, 7efcd81 says this:

Does not close #18, that issue is for file-based mapping.

But GitHub decided to interpret this as "closes #18" and closed this issue, reopening.

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