Re: wildcards alias?

Sam Varshavchik <[email protected]> Tue, 15 Jul 2025 22:19:50 -0400

Newsgroups	gmane.mail.imap.courier.general
Message-ID	<[email protected]>

JLX2 writes:

> so I was thinking of something like
>
> somestring....key...@mydomain : user
> ....user...key....eos@mydomain : user
> user...key[x-z0-9]{min,max}@mydomain : user
>
> in /etc alias configuration with . matching a single char, and [x-z0-9] 
> {min,max} matching anychar min times and max times like in posix regex
>
> .courier file don't seems to fit my need because it rely on finding the user  
> by selecting the start of the email
>
> I don't want that login@mydomain be usable (to prevent user spread login  
> info on some web site)
>
> is it possible?
>
> is it possible to achieve using some custom filter program? (eg writing my  
> custom "maildrop"), ie what happens to an email if the local user is not  
> found? I don't want also to rely on "virtual" global user, it's too privacy  
> problematic (one attacker obtaining access have access to all email of all  
> users....), I prefer to manage my user permission (ssh, vpn....)
>
> thanks and regards

Be prepared to do some script writing on your own: writing your own  
authentication module, which will take an arbitrary local address, and map  
it to a home directory, userid, and groupid. So, take whatever algorithm you  
want to use and implement it.

https://www.courier-mta.org/authlib/README_authlib.html#authpipe

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