strange file .temp.1592374672.P11164Q21M692534.hostname - doveadm altmove

dovecot 2.2.33.2 Ubuntu 18.04

I got strange file .temp.1592374672.P11164Q21M692534.hostname after doveadm altmove command in INBOX on alternate storage server

What can I do with this file? Remove? I am using dbox

regards