myfind /m/md/dmarc -type f -mtime +60 -execdir rm -- '{}' +
myfind /m/md/fsfalerts -type f -mtime +10 -execdir rm -- '{}' +
+# not strictly a mail directory, but it fits well in this script
+myfind /p/c/.editor-backups -type f -mtime +300 -execdir rm -- '{}' +
+
shopt -s nullglob