User sieve scripts not working at all

[elia-blue]

Hi,
I am currently experiencing the following problem: no matter what I do, I cannot get any Sieve script to process my incoming mail. The filter I am trying to apply is this one:

require "fileinto";

if address :matches "To" "[email protected]" {
  fileinto "Uni";
}

else { keep; }

I tried enabling it with sieve-connect (https://github.com/philpennock/sieve-connect) and the sieve GUI tool (https://github.com/thsmi/sieve), and both seem to be successful, which I can see when enabling a logger with level trace and following my managesieve listener:

2025-09-24T16:29:15Z DEBUG ManageSieve connection started (manage-sieve.connection-start) listenerId = "managesieve", localPort = 4190, remoteIp = 162.55.154.211, remotePort = 65150
2025-09-24T16:29:15Z DEBUG ManageSieve CAPABILITIES command (manage-sieve.capabilities) listenerId = "managesieve", localPort = 4190, remoteIp = 162.55.154.211, remotePort = 65150, tls = false, strict = true, elapsed = 0ms
2025-09-24T16:29:15Z TRACE Raw ManageSieve output sent (manage-sieve.raw-output) listenerId = "managesieve", localPort = 4190, remoteIp = 162.55.154.211, remotePort = 65150, size = 719, contents = ""IMPLEMENTATION" "Stalwart ManageSieve"\r\n"VERSION" "1.0"\r\n"STARTTLS"\r\n"SASL" "OAUTHBEARER XOAUTH2"\r\n"SIEVE" "body comparator-elbonia comparator-i;ascii-casemap comparator-i;ascii-numeric comparator-i;octet convert copy date duplicate editheader enclose encoded-character enotify envelope envelope-deliverby envelope-dsn environment ereject extlists extracttext fcc fileinto foreverypart ihave imap4flags imapsieve include index mailbox mailboxid mboxmetadata mime redirect-deliverby redirect-dsn regex reject relational replace servermetadata spamtest spamtestplus special-use subaddress vacation vacation-seconds variables virustest"\r\n"NOTIFY" "mailto"\r\n"MAXREDIRECTS" "1"\r\nOK "Stalwart ManageSieve at your service."\r\n"
2025-09-24T16:29:15Z DEBUG ManageSieve connection ended (manage-sieve.connection-end) listenerId = "managesieve", localPort = 4190, remoteIp = 162.55.154.211, remotePort = 65150, elapsed = 0ms
2025-09-24T16:29:19Z TRACE Raw ManageSieve input received (manage-sieve.raw-input) listenerId = "managesieve", localPort = 4190, remoteIp = 80.187.85.144, remotePort = 30610, size = 18, contents = "SETACTIVE "test"\r\n"
2025-09-24T16:29:19Z DEBUG ManageSieve SET ACTIVE command (manage-sieve.set-active) listenerId = "managesieve", localPort = 4190, remoteIp = 80.187.85.144, remotePort = 30610, id = "test", elapsed = 10ms
2025-09-24T16:29:19Z TRACE Raw ManageSieve output sent (manage-sieve.raw-output) listenerId = "managesieve", localPort = 4190, remoteIp = 80.187.85.144, remotePort = 30610, size = 14, contents = "OK "Success"\r\n"
2025-09-24T16:29:19Z TRACE Raw ManageSieve input received (manage-sieve.raw-input) listenerId = "managesieve", localPort = 4190, remoteIp = 80.187.85.144, remotePort = 30610, size = 13, contents = "LISTSCRIPTS\r\n"
2025-09-24T16:29:19Z DEBUG ManageSieve LIST scripts command (manage-sieve.list-scripts) listenerId = "managesieve", localPort = 4190, remoteIp = 80.187.85.144, remotePort = 30610, total = 2, elapsed = 0ms
2025-09-24T16:29:19Z TRACE Raw ManageSieve output sent (manage-sieve.raw-output) listenerId = "managesieve", localPort = 4190, remoteIp = 80.187.85.144, remotePort = 30610, size = 33, contents = ""entrypoint"\r\n"test" ACTIVE\r\nOK\r\n"

But, while the server is ingesting my mails just fine, no filter is applied and no trace of my filters are present in the logs. I did not set and sieve configuration options, as I understand, sieve user scripting is always active with the untrusted compiler? Is there anything else I am missing?

Thank you in advance.

[pepa65]

Try require [fileinto"];

[elia-blue]

I have tried that, it does not change the behaviour at all.

[pepa65]

Ah, you will also need these: require [fileinto", "address", "fileinto", "keep"];

[elia-blue]

Thank you! But I have tried that too now, it doesn't work either, sadly.

[pepa65]

You have added the script's name at Settings > SMTP > Inbound > DATA stage: Data Stage > Run Script, right?

Oh, and if it's a User script, you need something more, but I can't help you there, I'm only using a System script.

[elia-blue]

Yea, it's a user script, so I did not add it in the SMTP configuration of the server.

[pepa65]

If it never gets triggered, it will never run.

[andreymal]

@pepa65 user sieve scripts run automatically if they are marked as active
(I hope that "I tried enabling it" means that the script is actually active)

[elia-blue]

Yes, my script was actually active, but see my other reply for the solution.

[pepa65]

@pepa65 user sieve scripts run automatically if they are marked as active

Thanks for education me, and sorry for spouting my wrong assumptions.

[andreymal]

First of all, remove if and run fileinto :create "Uni"; unconditionally to force the script to do something and make sure you didn't make any mistake in if or the folder name

If even fileinto :create "Uni"; won't work, then maybe something is wrong with Stalwart

[elia-blue]

I have tried that, which helped me solve my problem: Stalwart does not use the . as a path delimiter, but uses the /. So when porting my Sieve scripts from Dovecot to Stalwart, the paths didn't line up anymore and because I was not specifying the :create parameter, the fileinto command always silently failed. By adjusting my script to the following, I have everything working again.

require ["fileinto", "mailbox"];
if address :matches "To" ["[email protected]", "[email protected]"] {
  fileinto "INBOX/Uni";
}

Thank you for your pointer and your help!