mailbox TESTSUITE/test-mail/userx is locked
writing to file TESTSUITE/test-mail/userx
writing data block fd=dddd size=sss timeout=0
-process pppp running as transport filter: fd_write=10 fd_read=11
+process pppp running as transport filter: fd_write=9 fd_read=10
writing data block fd=dddd size=sss timeout=0
process pppp writing to transport filter
copying from the filter