[Dovecot] Dovecot deliver discards emails (mail loss)

[Steffen Kaiser]

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On Tue, 8 May 2007, Justin McAleer wrote:

> Steffen Kaiser wrote:

>>  msgid=<200705080749.l487nclf029596 at ux-2s11-9.inf.fh-bonn-rhein-sieg.de>: 
>> Return-Path missing, rejection reason: Not enough disk space
>> May  8 09:49:53 ux-2s11-9 sendmail[29618]: l487nclf029596: to="| 
>> /etc/mail/runde", ctladdr=dvtest (31045/102), delay=00:00:15, 
>> xdelay=00:00:00, mailer=prog, pri=120033, dsn=2.0.0, stat=Sent

> Was the return-path of that message indeed empty/missing as indicated? Can 
> you show the entire log history for message id l487nclf029596? Of course, if 
> there was no return-path, then no bounce would be generated.

History of sendmail? Dunno, but here it is:
May  8 09:49:45 ux-2s11-9 sendmail[29596]: l487nclf029596: from=root, 
size=33, class=0, nrcpts=1, msgid=<200705080749.l487nclf029596 at ux-2s
11-9.inf.fh-bonn-rhein-sieg.de>, relay=root at localhost
May  8 09:49:45 ux-2s11-9 sendmail[29596]: l487nclf029596: to="| 
/etc/mail/runde", delay=00:00:07, mailer=prog, pri=30033, stat=queued
May  8 09:49:53 ux-2s11-9 deliver(dvtest): Loading modules from directory: 
/usr/local/dovecot/lib/dovecot/lda
May  8 09:49:53 ux-2s11-9 deliver(dvtest): Module loaded: 
/usr/local/dovecot/lib/dovecot/lda/lib10_quota_plugin.so
May  8 09:49:53 ux-2s11-9 deliver(dvtest): Module loaded: 
/usr/local/dovecot/lib/dovecot/lda/lib20_mail_log_plugin.so
May  8 09:49:53 ux-2s11-9 deliver(dvtest): Module loaded: 
/usr/local/dovecot/lib/dovecot/lda/lib90_cmusieve_plugin.so
May  8 09:49:53 ux-2s11-9 deliver(dvtest): maildir: 
data=/home/dvtest/MailDir:CONTROL=/var/cache/dovecot/31045/control:INDEX=/var/cache/do
vecot/31045/index
May  8 09:49:53 ux-2s11-9 deliver(dvtest): maildir: 
root=/home/dvtest/MailDir, index=/var/cache/dovecot/31045/index, 
control=/var/cache/do
vecot/31045/control, inbox=
May  8 09:49:53 ux-2s11-9 deliver(dvtest): fs quota add storage dir = 
/home/dvtest/MailDir
May  8 09:49:53 ux-2s11-9 deliver(dvtest): fs quota block device = 
/dev/mapper/mailstud-mailstud
May  8 09:49:53 ux-2s11-9 deliver(dvtest): fs quota mount point = /home
May  8 09:49:53 ux-2s11-9 deliver(dvtest): 
msgid=<200705080749.l487nclf029596 at ux-2s11-9.inf.fh-bonn-rhein-sieg.de>: 
save failed to INBOX
May  8 09:49:53 ux-2s11-9 deliver(dvtest): 
msgid=<200705080749.l487nclf029596 at ux-2s11-9.inf.fh-bonn-rhein-sieg.de>: 
Return-Path missing, rejection reason: Not enough disk space
May  8 09:49:53 ux-2s11-9 sendmail[29618]: l487nclf029596: to="| 
/etc/mail/runde", ctladdr=dvtest (31045/102), delay=00:00:15, xdelay=00:0
0:00, mailer=prog, pri=120033, dsn=2.0.0, stat=Sent


=====================

Well, I have three problems with the situation:

a) sendmail will send bounces easily, when Deliver's exit code is != 0 and 
!= Tempfail. Moreover, the sendmail log wouldn't claim that the mail had 
been delivered successfully in this case.
You can return any message by printing to stdout or stderr.

b) "rejection reason: Not enough disk space" is not a permanent, but a 
temporary failure.
 		error = mail_storage_get_last_error(storage, &syntax,
 						    &temporary_error);
in src/deliver/deliver.c near line 700 should set temporary_error.

c) If Deliver cannot send the bounce - for whatever reason -, it had not 
saved the message either, hence, it must not simply ignore the fact, but 
at least should tempfail the mail.
So I do interprete the "return smtp_client_close(smtp_client);" near line 
121 of src/deliver/mail-sent.c as well for the case that the rejection is 
attempted.

You have been right, sendmail does not put Return-Path into the mail, but 
a From<SPACE> only, when using the .forward mechanism. When using Deliver 
as mailer, there is the Return-Path.

Bye,

- -- 
Steffen Kaiser
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