Hi all.
I spent some time testing Dovecot's LDA sieve plugin and found problem
with "notify" method.
In fact it always returns "generic sieve error"... and thus produces
bounce messages like this:
-----
Your message was automatically rejected by Dovecot Mail Delivery Agent.
The following reason was given:
Unknown error
----
Deliver logs error: "generic sieve error", but otherwise server
reports "notify" method as supported.
The problem is: original code was taken from curys sieve and requires
"notifyd", as sieve runs 'chrooted'
and can't access external binaries like "sendmail". communications
with notifyd is done via socket.
Thus I wrote pacth, which ads "notify" functionality to dovecot's
sieve plugin, at less "notify:mailto" method.
cyrus originally contains null, log and zephyr methods.
null and log is useless with dovecot, zephur is cyrus specific...
RFC docs says there is 3 available methods SMS, XMPP and MAILTO:
------
method can be an SMS URI [SMS-URI
<http://ietfreport.isoc.org/idref/draft-ietf-sieve-notify/#ref-SMS-URI>]
containing a phone number, or an
XMPP [XMPP
<http://ietfreport.isoc.org/idref/draft-ietf-sieve-notify/#ref-XMPP>] URI
containing an XMPP identifier [XMPP-URI
<http://ietfreport.isoc.org/idref/draft-ietf-sieve-notify/#ref-XMPP-URI>]
The supported URI values will be site-specific, but support for the
[MailTo
<http://ietfreport.isoc.org/idref/draft-ietf-sieve-notify/#ref-MailTo>]
method is REQUIRED in order to insure interoperability. If
a URI schema is specified that the implementation does not support,
the notification MUST cause an error condition. Sieve scripts can
check the supported methods using the "valid_notify_method" test to
be sure that they only use supported ones, to avoid such error
conditions.
------
as SMS-URI and XMPP methods are not included in cyrus sieve version, they are
not available in dovecots plugin too.
[any ideas, sample code how to implement them?]
BUT... WARNING
All this will not work if you have "mail_chroot" setting enabled in
dovecot.conf; chrooted process can't access required external binaries.
DOT USE THIS PLUGIN WITH "mail_chroot" SENTIG ENABLED!
Actualy it is not sieve plugin problem only - its LDA problem... it can't
send bonce messages, do forwards etc.
Question to Timo:
Do You have ideas how to fix it? My be disable chroting for LDA at all? or do it
"cyrus way" - move all calls to external binaries to sepreate, non
chrooted process?
For delivery agent it is requred to be able send bounces and notifications... do
forwards.
Uldis
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