Hello,
I have a question about the Sieve Vacation module. Currently, the automatic reply doesn't include the "References" header from the original email. It often has an "In-Reply-To" header: ``` Message-ID: <cmu-sieve-392859-1781788754-1@hermes> Date: Thu, 18 Jun 2026 15:19:14 +0200 X-Sieve: CMU Sieve 3.0 X-Sieve-Action: vacation From: <[email protected]> To: <[email protected]> Subject: Received/Erhalten: Re: Received/Erhalten: Howdy! In-Reply-To: <46ce3dd0-2763-4f88-aca2-04ff30254ba4@ <mailto:[email protected]>example.xyz> Auto-Submitted: auto-replied (vacation) MIME-Version: 1.0 ``` The "References" header would be great, so mail clients can better associate messages with conversations. Thunderbird, f.ex. does successfully show the first reply in the thread, but any further automatic replies are not in the thread anymore, because of the missing references. Would it be possible for the Cyrus Vacation module to properly generate the "References" header according to RFC 5322 Section 3.6.4 (e.g., by appending the original email's Message-ID to its existing References)? Are there any reasons why that wouldn't be possible? I read on this thread <https://dovecot.org/mailman3/archives/list/[email protected]/thread/QDJB3R2DTIIDY3774BJRR64FURIMJ2CO/>, that Dovecot (apparently) does it. I am currently running Cyrus 3.4.3. I couldn't verify if this behavior has already been changed in more recent versions up to 3.12. If it has, a quick heads-up would be appreciated—otherwise, I would highly appreciate this improvement. Thanks, Dominik ------------------------------------------ Cyrus: Info Permalink: https://cyrus.topicbox.com/groups/info/T1e0a33d7e4710322-M8ff9ea36ef18083000619ba3 Delivery options: https://cyrus.topicbox.com/groups/info/subscription
