On Tue, Nov 26, 2019, at 5:13 AM, Claudio Corvino via dovecot wrote:
Hi everyone,
we have a duplicate e-mail problem with Dovecot 2.2.13 (LMTP as MDA) on a Debian 8 server.
Our users are on external LDAP.
We just need to setup a vacation responder (with Sieve) for our employees with a redirect to an alias (a distribution list), let's call it *LIST@domain.com*, that comprehends even the user that just activated the out of office.
This generates a loop: when someone write to LIST@domain.com every user of the aforementioned distribution list receives a duplicate e-mail generated from the sieve script of the user with vacation responder active that contains the redirect to LIST@domain.com.
We just tried activating the duplicate extension into sieve script but the redirected e-mail has a different MSG-ID and it's not recognized as a duplicate by the server.
Our dovecot conf is:
[snip]
An example of user sieve script is:
*require ["vnd.dovecot.duplicate","copy","fileinto","vacation-seconds"]; # rule:[Outofoffice] if true { vacation :addresses "xxxxxxx@domain.tld" :subject "Automatic Reply" text: *
*<Text here> . ; fileinto "INBOX";*
- redirect "LIST@domain.com";*
*}*
You've not used the duplicate test anywhere in your example. See the RFC for examples: https://tools.ietf.org/html/rfc7352#section-5
Specifically, example 3 might help: https://tools.ietf.org/html/rfc7352#section-5.3
but most simply, you can probably replace if true with if not duplicate
V/r, James Cassell