History mails are stored in the tmp/ directory

[lty]

We found that there are historically corrupted mails in the tmp/ 
directory,
For example, Maildir/tmp/ or Maildir/.Drafts/tmp/ exists.
We suspect that it may be caused by network transmission, or the user 
interrupted the network link.
Can the dovecot team possibly fix this problem?
dovecot --version
2.2.36