==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): latest
- Deployed with iRedMail Easy or the downloadable installer? downloadable
- Linux/BSD distribution name and version: Centos7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): nginx
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I was seeing disk size starting to grow faster than expected, and found what appear to be orphaned emails in tmp directories. For instance one user has 138GB in the .Sent/tmp folder, which doesn't show in their disk usage. What are those, why and how might they have been created, and can I safely just delete all of those files. There other largish tmp directories, but I think that is the biggest.