Having temp mdbox files, what to do with them?

Can I delete these because doveadm is only purging from source, when it is confirmed they are correctly at the destination?

[@ storage]# ls -ac1rt m.554 m.569 m.564 m.559 m.561 .temp.1548002572.P1969Q0M313023.mail03 .temp.1548002572.P1969Q1M313023.mail03 .temp.1548002572.P1969Q2M313023.mail03 . .temp.1548002572.P1969Q3M313023.mail03