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In my setup the mail folders are owned by a system user per domain (eg sam:sam for @sam.com) with permissions 750 which I would like to keep this way. To redirect spam to the Junk folder, it is often recommended to use the

spamassassin unix -      n       n       -       -       pipe
    flags=DROhu user=vmail:vmail argv=/usr/bin/spamc -f -e
    /usr/libexec/dovecot/deliver -f ${sender} -d ${user}@${nexthop}

line in master.cf (with dovecot-sieve etc.), but this will run as vmail:vmail and is unable to deliver mail in the mailboxes.

  1. Can the user=vmail:vmail be set dynamically from the virtual user table in MySQL (which contains the system user name per domain)?
  2. Or can I use a different delivery binary that runs as root for example? LMTP?

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