[Dovecot] Issues with Plus addressing and detail part of subaddress.

[Charles Marcus]

On 2012-07-17 3:32 AM, Sean Kamath <kamath at moltingpenguin.com> wrote:
> I was sure it wasn't a bug, it was a screwup on my part in the
> configuration, so I didn't read the bugreport page.

Actually, although it is called 'bugreport', you get to it via the 
'Troubleshooting' link on the wiki...

But no worries, you've now provided everything that should be needed (I 
know nothing about sendmail, and won't be much help for the rest, but 
someone else will likely be able to see what is happening)...

> I really thought it would be a simple "here's what you missed", since
> the logs are relatively uninformative...

The point is, what may appear to be uninformative to you may tell Timo 
(or someone else who knows what to look for) all they need to know to 
pinpoint the problem.

>I certainly wasn't trying to be cryptic.

I know, but as you can see, the dovecot -n output really tells a lot - 
like what version you're on, and even what OS and filesystem.

> Here's the complete set of everything. I wrote a little script to do
> this repeatedly, to make it easy to make changes and try again.

One thing I did notice is that you are sending this mail from an 
internal IP... since most people use very different checks for such mail 
(bypassing many/most checks), maybe you should be testing from an 
external address (one that comes in from outside your network)?

> Note that in the last test, it works. Simply adding "X-Original-To:
> rewards+test at enoent.net" and sending the same message with
> "/usr/lib/sendmail -t< msg" will do what's expected.



> Command: dovecot -n
> ----------------------------------------
> # 2.0.13: /etc/dovecot/dovecot.conf

Also, it is always recommended when setting up a new server to start 
with the latest version... for 2.0.x that would be 2.0.19, but the 
latest is 2.1.8...

> lda_original_recipient_header = X-Original-To
> lmtp_save_to_detail_mailbox = yes

Ok, I think this is the problem...

Dovecot's LMTP currently does NOT preserve the x-original-to header... 
in fact, brought this up recently (I was one of the ones interested in 
Timo adding support for it) on this (and the postfix, which is what I 
use) on this very list:

http://www.dovecot.org/list/dovecot/2012-April/065075.html

Apparently, after Timo discussed this on the postfix list, he determined 
that it would not be a very significant change for him to make to add 
support for this header in LMTP and that he would get to it sooner than 
later, but as of now, it has not been added.

-- 

Best regards,

Charles