Shared mailbox Seen flag not migrated

[DavidePrincipi]

Mail private Seen IMAP flags are not migrated for shared mailboxes.

Steps to reproduce

• In NS7 configure Email with users first.user and second.user
• Configure Email with Shared Seen disabled (see https://docs.nethserver.org/en/v7/mail.html#shared-seen-configuration)
• second.user shares a mailbox myseconds with first.user. Put some messages into myseconds
• first.users marks some messages Shared/myseconds as Seen (Read)
• Migrate Email to NS8

Expected behavior

After migration, messages of Shared/myseconds are marked Seen/Unseen as before.

Actual behavior

All messages are marked Unseen (New).

Workaround is:

cp -vp first.user/Maildir/shared/second.user\@example.org/.INBOX/dovecot.index.pvt first.user/Maildir/shared/second.user/.INBOX/dovecot.index.pvt

In /var/log/messages:

Apr 24 17:45:46 cluster agent@mail1[17337]: 'first.user/Maildir/shared/second.user@example.org' -> '{shared_entry%%@example.org}/second.user@example.org'

Components

• Mail 1.6.2

See also

• Discussion https://mattermost.nethesis.it/nethesis/pl/8ns9dwdthpdu7cfa4amoic8t7c

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Thanks to @lucagasparini

[DavidePrincipi]

In Testing: Mail 1.6.3-dev.1

Test case

• Execute NS7 Email migration (do not finalize account provider) with the stable 1.6.2 version and check the bug is reproducible (sorry, I didn't check it). Ensure that Shared Seen is disabled in NS7.
• Run the documented migration "step back" procedure on NS7, enable the "testing" mode for NS8 default apps repo and repeat the NS7 migration with Mail 1.6.3-dev.1. Check that Shared Seen on NS8 mailboxes is the same of NS7.

[mrmarkuz]

Test case verified

• Bug is reproducible, all mails in the migrated shared mailbox were unseen.
• Using mail 1.6.3-dev.1 the seen flag is correctly preserved on NS8 after migration.