I see the following history in my log during message delivery:
Mar 1 13:35:09 mailserver postfix/pickup[21464]: 5FAFC2A002: uid=0 from=<root> Mar 1 13:35:09 mailserver postfix/cleanup[21526]: 5FAFC2A002: message-id=20090301213509.5FAFC2A002@mailserver.amfeslan.local Mar 1 13:35:09 mailserver postfix/qmgr[21429]: 5FAFC2A002: from=root@mailserver.amfeslan.local, size=367, nrcpt=1 (queue active) Mar 1 13:35:09 mailserver dovecot: auth(default): master in: USER^I1^Idmiller@amfes.com^Iservice=deliver Mar 1 13:35:09 mailserver dovecot: auth(default): master out: USER^I1^Idmiller@amfes.com^Iuid=5000^Igid=8^Ihome=/var/mail/amfes.com/dmiller^Imail=dbox:/var/mail/amfes.com/dmiller/Maildir
Mar 1 13:35:10 mailserver deliver(dmiller@amfes.com): fdatasync_path(/var/mail/amfes.com/dmiller/Maildir/INBOX/dbox-Mails) failed: Invalid argument Mar 1 13:35:10 mailserver deliver(dmiller@amfes.com): msgid=20090301213509.5FAFC2A002@mailserver.amfeslan.local: saved mail to INBOX Mar 1 13:35:10 mailserver postfix/pipe[21528]: 5FAFC2A002: to=dmiller@amfes.com, relay=dovecot, delay=1.1, delays=0.07/0.01/0/1, dsn=2.0.0, status=sent (delivered via dovecot service) Mar 1 13:35:10 mailserver postfix/qmgr[21429]: 5FAFC2A002: removed
-- Daniel