[PLUG] Mail received by system but not delivered to mailbox

[Rich Shepard]

   This has not happened before last Friday. I was sent 5 email messages and
/var/log/maillog.3 records their reception:

/var/log/maillog.3:Mar 17 14:07:44 salmo postfix/qmgr[2840]: 71A48992DD:
from=<sender_redacted>, size=29185, nrcpt=1 (queue active)
/var/log/maillog.3:Mar 17 14:09:42 salmo postfix/qmgr[2840]: DA372992DD:
from=<sender_redacted>, size=2186410, nrcpt=1 (queue active)
/var/log/maillog.3:Mar 17 14:10:53 salmo postfix/qmgr[2840]: 4C2A8992DD:
from=<sender_redacted>, size=335663, nrcpt=1 (queue active)
/var/log/maillog.3:Mar 17 14:13:05 salmo postfix/qmgr[2840]: 23279992DD:
from=<sender_redacted>, size=14423018, nrcpt=1 (queue active)
/var/log/maillog.3:Mar 17 14:13:35 salmo postfix/qmgr[2840]: C03A1992DD:
from=<sender_redacted>, size=12951, nrcpt=1 (queue active)

but none appeared in my alpine INBOX.

   Does anyone have an idea what might have happened?

Puzzled,

Rich