[Dovecot] PATCH: sendmail-like DSNs in Dovecot deliver (EX_TEMPFAIL always)

[Steffen Kaiser]

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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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