Sieve filters migrated from NS7 sometimes do not work

[lucagasparini]

Inbox rules that move or copy messages to shared account folders on NS7 report the destination as Shared/account@domain/folder.
Migrating these rules to NS8 stops them working because the destination has changed to Shared/account/folder (without @domain).

Steps to reproduce

• On NS7, share an entire mail account (e.g., info shared with user1)
• Create a sieve filter that moves messages from a specific sender to the shared account's INBOX.
• Migrate the mail module to NS8.

Expected behavior

• The migrated sieve filter continues to work.

Actual behavior

• The migrated sieve filter doesn't work and the log shows something like this:

sieve: info: started log at XXX
error: msgid=<XXXXXXX>: fileinto action: failed to store into mailbox 'Shared/info@domain.test/INBOX': Mailbox doesn't exist: Shared/info@domain.test/INBOX

Components

nethserver-ns8-migration-1.3.4-1.ns7.x86_64

[stephdl]

verified
once migrated

[root@R4-pve ~]# cat  /home/mail1/.local/share/containers/storage/volumes/dovecot-data/_data/stephane/sieve/webtop5.sieve 
# Generated by WebTop [http://www.sonicle.com]
# com.sonicle.webtop.mail@5.22.1
# 2026-03-10 10:35:29

require ["fileinto"];
# rule:[test]
if allof (header :comparator "i;ascii-casemap" :contains ["from","From","FROM"] "stephane@ns7-pve2.org")
{
        fileinto "Shared/helene@ns7-pve2.org/INBOX";
}

the filter once migrated does not work anymore, if you open again the filter and corect it with the webtop ui, this is the workable configuration

[root@R4-pve ~]# cat  /home/mail1/.local/share/containers/storage/volumes/dovecot-data/_data/stephane/sieve/webtop5.sieve 
# Generated by WebTop [http://www.sonicle.com]
# com.sonicle.webtop.mail@5.25.2
# 2026-03-10 10:57:10

require ["fileinto"];
# rule:[test]
if allof (header :comparator "i;ascii-casemap" :contains ["from","From","FROM"] "stephane@ns7-pve2.org")
{
        fileinto "Shared/helene/INBOX";
}

you can find in log

[root@R4-pve ~]# cat   /home/mail1/.local/share/containers/storage/volumes/dovecot-data/_data/stephane/.dovecot.sieve.log 
sieve: info: started log at 2026-03-10 10:54:04 +0000.
error: msgid=<952033533.2.1773140043328@webtop>: fileinto action: failed to store into mailbox 'Shared/helene@ns7-pve2.org/INBOX': Mailbox doesn't exist: Shared/helene@ns7-pve2.org/INBOX.

[stephdl]

QA Test Case: Sieve Filters Migration for Shared Folders

Prerequisites

• NS7 with mail module configured
• Two user accounts (user1 and info)
• NS8 target system with mail:1.7.7-dev.2

Setup

1. On NS7, share entire mail account (info shared with user1)
2. User1 creates a sieve filter that moves messages from a specific sender to shared account INBOX
3. Verify sieve filter contains path like Shared/info@domain.test/INBOX
4. Send test email from the configured sender to verify filter works on NS7

Test Steps

1. Perform NS7 to NS8 migration using nethserver-ns8-migration
2. Import mail module to NS8 (using mail:1.7.7-dev.2)

[root@NS2 ~]# cat  /usr/share/nethesis/nethserver-ns8-migration/apps/nethserver-mail/bind.env
# This file is included by ns8-bind-app
MODULE_VOLUMES="dovecot-data rspamd-redis"
MODULE_IMAGE_URL="ghcr.io/nethserver/mail:1.7.7-dev.2"

3. Check migrated sieve filter file for user1:

runagent -m mail1
podman exec -ti dovecot ls -la /var/lib/vmail/vmail1/domain.test/user1/sieve/
podman exec -ti dovecot cat /var/lib/vmail/vmail1/domain.test/user1/sieve/webtop.sieve

4. Verify the fileinto destination path format in sieve script
5. Send test email from configured sender to user1
6. Verify message is moved to Shared/info/INBOX

Expected Results

• Sieve filter path is automatically converted from Shared/info@domain.test/INBOX to Shared/info/INBOX
• Filter executes successfully after migration
• Messages are correctly moved to shared folder
• No errors in dovecot logs about non-existent mailboxes
• Sieve script contains corrected path format without @domain

Actual Results Before Fix

• Sieve filter retains old path format Shared/info@domain.test/INBOX
• Filter fails to execute with error:

sieve: info: started log at XXX
error: msgid=<XXXXXXX>: fileinto action: failed to store into mailbox 'Shared/info@domain.test/INBOX': Mailbox doesn't exist: Shared/info@domain.test/INBOX

• Messages not moved to destination folder
• Sieve filter broken after migration

Module Version

• mail:1.7.7-dev.2