I have had a mailbox mynane@mydomain.de I deleted this mailbox and I get frequently:
If I recreate the mailbox the errors are gone, deleting the mailbox the errors are there again. the directory /var/vmail/mydomain.de/mynane/ is deleted - as it should ..
Code:
Feb 11 18:42:42 mail postfix/pipe[11330]: 03CB8300D5A: to=<mynane@mydomain.de>, relay=maildrop, delay=117975, delays=117975/0.03/0/0.02, dsn=4.3.0, status=deferred (temporary failure. Command output: /usr/bin/maildrop: Unable to create a dot-lock at /var/vmail/mydomain.de/mynane/11331.0.mail. )
Feb 11 18:42:42 mail postfix/pipe[11330]: 7ED08300E48: to=<mynane@mydomain.de>, relay=maildrop, delay=109675, delays=109675/0.03/0/0.01, dsn=4.3.0, status=deferred (temporary failure. Command output: /usr/bin/maildrop: Unable to create a dot-lock at /var/vmail/mydomain.de/mynane/11336.0.mail. )