# mailbox locking
exim -odi userx
+Subject: First
Transport: local_delivery
First message.
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exim_lock -v test-mail/userx
exim -odi userx
+Subject: Second
Transport: local_delivery
Second message
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exim_lock -v -fcntl test-mail/userx
exim -odi userx
+Subject: Third
Transport: local_delivery_fcntl
Third message
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exim_lock -v -fcntl test-mail/userx
exim -odi userx
+Subject: Fourth
Transport: local_delivery_fcntl_blocking
Fourth message
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