Server migration with rsync seems buggy

Hello List,

we migrated from Debian 4 to Debian10 and moved the mailboxes with rsync like this:

  rsync -sptq -dirs --delete-delay --no-inc-recursive $Source:"$sourcedir" "$targetdir"
  chown -R cyrus:mail "$targetdir"
  su cyrus -c "/usr/lib/cyrus/bin/reconstruct -q -s -f \"$mboxSource\"" 2>&1 >/dev/null

The problem we face now is that new mails only appear when we start a imap client (like thunderbird).
One the connection is open, we dont see new incoming mails, even if we force to check for new mails.

Any hints/ideas on this?

Cheers,
Michael

p.s next time we will use imapsync i guess :-P
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