I've just compiled and installed courier-0.20 on redhat linux 6.2, i386. It compiled fine, passed _all_ the tests described on the INSTALL page (including the delivered-to: header count, and there were no deferrals).

It's running OK so far, and these are some of my observations:

1. the docs on the website say makealiases is in .../bin, but it's actually in .../sbin. Same for all the makesomething programs.

2. the courier local delivery component adds the return-path: and delivered-to: headers in the opposite order to most other MTAs (qmail, postfix), ie. delivered-to: appears right at the top, followed by return-path:. Any particular reason?

3. The courieresmtpd component returns a list of ESMTP capabilities, regardless of whether a HELO or EHLO was used. From what I know, only a single line containing the hostname should be returned with HELO, otherwise some clients have a problem, because they only expect a single line, and instead get a multiline response.

Nothing else to report so far.