dovecot - May 2007 - PATCH: sendmail-like DSNs in Dovecot deliver (EX_TEMPFAIL always)

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Hello,

I've put together an always tempfail & sendmail-like DSN report back 
patch.

Because I don't know how to transform the rejection reason into sysexit.h 
codes, it always tempfails.

The hooks are so that:

a) config file setting:

lda_mode = mode

b) command line:

deliver --mode mode

where mode is default or sendmail.

When no mode is specified, it defaults to "default", which is the
current
behaviour.

In sendmail mode, mail_send_rejection() simply prints the rejection reason 
to stdout, logs it and returns EX_TEMPFAIL.
Ideally, the return value would be specific to the reason. I haven't poked 
into this deeply, but it doesn't look straight forward.

Bye,

- -- 
Steffen Kaiser
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Steffen Kaiser schrieb:
> Hello,
> 
> I've put together an always tempfail & sendmail-like DSN report
back patch.
> 
> Because I don't know how to transform the rejection reason into
> sysexit.h codes, it always tempfails.
Just read /usr/include/sysexits.h and pick the best fit, such as
EX_NOPERM. 8-)

On Wed, 2007-05-09 at 15:31 +0200, Steffen Kaiser wrote:
> The hooks are so that:
> 
> a) config file setting:
> 
> lda_mode = mode
> 
> b) command line:
> 
> deliver --mode mode
> 
> where mode is default or sendmail.
> 
> When no mode is specified, it defaults to "default", which is the
current
> behaviour.
Since I can't think of any other modes, how about just a simple -e
parameter which means that rejections are done by writing the error to
stderr and exiting with EX_NOPERM.
> In sendmail mode, mail_send_rejection() simply prints the rejection reason 
> to stdout, logs it and returns EX_TEMPFAIL.
Shouldn't it be stderr, not stdout? Although I guess both might work.
> Ideally, the return value would be specific to the reason. I haven't
poked
> into this deeply, but it doesn't look straight forward.
I don't think there are any useful exit codes in sysexits.h. Hmm.
Deliver fallbacks always trying to write mail to INBOX if it couldn't
write it elsewhere. So INBOX writes can fail only with:

1. permission problems
2. out of quota

In INBOX cause 1. is probably a configuration problem. In this case it
should be treated as temporary problem.

2. should probably be configurable, as some people want it to be a
temporary failure and others want it to be a permanent failure.

I guess I'll have to go and fix Dovecot's error handling a bit.

For now I added the -e parameter. Currently it only works if the
delivery actually fails. I'm not sure how I should handle rejections in
Sieve scripts. http://dovecot.org/list/dovecot-cvs/2007-May/008761.html
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On Sun, 13 May 2007, Timo Sirainen wrote:
> Since I can't think of any other modes,
I'm going to look into adding LMTP to deliver ;-)
sendmail supports LMTP even for a spawned LDA rather than a LMTP deamon. 
However, I don't know what to prefer.
> Shouldn't it be stderr, not stdout? Although I guess both might work.
Well, I'm not sure. But as far as I know sendmail communicates primarily 
with stdin/stdout with the LDA (as inetd). However, for permanent failures 
both stdout and stderr are joint together. I haven't read the sendmail 
sources well enough to find the actual piece of code, though.
> For now I added the -e parameter. Currently it only works if the
> delivery actually fails. I'm not sure how I should handle rejections in
> Sieve scripts. http://dovecot.org/list/dovecot-cvs/2007-May/008761.html
I think Dovecot should.

Bye,

- -- 
Steffen Kaiser
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