[courier-users] dot-courier questions: dash vs plus

Regarding the dot-courier behavior, where users can "...receive mail
addressed to user-foo@domain, for arbitrary values of foo...", I'm
curious why the dash was selected for this purpose.

Is it possible to (reasonably painlessly) substitute the plus for the
dash in this functionality?

I've done some minimal testing with the
/etc/courier/aliasdir/.courier-default file and found that I can double
pipe to a script that cuts the portion from the + to the @ and returns
the intended target email address. Assuming that I can figure out the
correct exit status to return, to properly handle subsequent delivery
failures, are there any potential problems with this workaround?

One thing that I've noticed is that if the original RECIPIENT address is
string1-string2+plusString@domain, and "string1" exists as a valid USER,
the message never makes it to the /etc/courier/aliasdir/.courier-default
process, described in the dot-courier documentation as the final step in
the default delivery processing. None of the users involved in the test
have a .courier-default file. This behavior suggests that Courier is
seeing that string1 exists as a valid USER, looks for delivery
instructions related to that USER for the RECIPIENT address
"string1-string2+plusString@domain", doesn't find any (no
..courier-default file for the USER "string1"), and so fails the delivery.

Given this behavior, I'm curious what will happen under the following
scenario:
With two different users: "jane.smith" and "jane.smith-jones", will
emails sent to "jane.smith-jones@domain" ever reach her? Or will Courier
attempt to deliver to "jane.smith", find no .courier-default file in the
"jane.smith" home directory, and bounce the message? (Without going
forward to look further for delivery instructions, as described in the
Default delivery instructions section of the dot-courier documentation.)

Thanks in advance for any light you can shed on this functionality.

--

-Jerome


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Jerome Bullert writes:

> Regarding the dot-courier behavior, where users can "...receive mail
> addressed to user-foo@domain, for arbitrary values of foo...", I'm
> curious why the dash was selected for this purpose.

Originally, for compatibility with qmail.

> Given this behavior, I'm curious what will happen under the following
> scenario:
> With two different users: "jane.smith" and "jane.smith-jones", will
> emails sent to "jane.smith-jones@domain" ever reach her?

Yes.


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