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

[Maciek Jackowski]

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