Email between mailboxes on the same domain going missing?

[Red Paint]

Hello,

I'm hoping for a little guidance on this as I'm not sure what's going wrong. Could someone tell me why this message was not delivered/received? The domains both sit on the same domain with the same DNS and SPF rules on the same box running plesk and qmail.

Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: from=n@*.com
Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: to=p@*.com
Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: hook_dir = '/usr/local/psa/handlers/before-queue'
Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: call_handlers: call executable = '/usr/local/psa/handlers/info/05-grey-hd4XFa/executable'
Jun 20 16:15:19 plesk greylisting filter[95473]: Starting greylisting filter...
Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: handlers_stderr: SKIP
Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: call_handlers: SKIP during call '/usr/local/psa/handlers/info/05-grey-hd4XFa/executable' handler
Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: call_handlers: call executable = '/usr/local/psa/handlers/info/10-spf-zw1yHc/executable'
Jun 20 16:15:19 plesk spf filter[95474]: Starting spf filter...
Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: handlers_stderr: SKIP
Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: call_handlers: SKIP during call '/usr/local/psa/handlers/info/10-spf-zw1yHc/executable' handler
Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: recipient[3] = 'p@*.com'
Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: handlers dir = '/usr/local/psa/handlers/before-queue/recipient/p@*.com'
Jun 20 16:15:19 plesk qmail-queue-handlers[95472]: starter: submitter[95475] exited normally
Jun 20 16:15:19 plesk qmail: 1308582919.573054 new msg 39144980
Jun 20 16:15:19 plesk qmail: 1308582919.573130 info msg 39144980: bytes 209776 from <n@*.com> qp 95475 uid 2020
Jun 20 16:15:19 plesk qmail: 1308582919.574538 starting delivery 30082: msg 39144980 to local 95-p@*.com
Jun 20 16:15:19 plesk qmail: 1308582919.574605 status: local 1/100 remote 0/100
Jun 20 16:15:19 plesk qmail-local-handlers[95476]: Handlers Filter before-local for qmail started ...
Jun 20 16:15:19 plesk qmail-local-handlers[95476]: from=n@*.com
Jun 20 16:15:19 plesk qmail-local-handlers[95476]: to=p@*.com
Jun 20 16:15:19 plesk qmail-local-handlers[95476]: mailbox: /usr/local/psa/qmail/mailnames/*.com/p
Jun 20 16:15:19 plesk qmail-local-handlers[95476]: hook_dir = '/usr/local/psa/handlers/before-local'
Jun 20 16:15:19 plesk qmail-local-handlers[95476]: recipient[3] = 'p@*.com'
Jun 20 16:15:19 plesk qmail-local-handlers[95476]: handlers dir = '/usr/local/psa/handlers/before-local/recipient/p@*.com'
Jun 20 16:15:19 plesk qmail-local-handlers[95476]: call_handlers: call executable = '/usr/local/psa/handlers/info/10-spam-NOG1jB/executable'
Jun 20 16:15:19 plesk spamd[74859]: spamd: got connection over /tmp/spamd_full.sock
Jun 20 16:15:19 plesk spamd[74859]: spamd: using default config for p@*.com: /usr/local/psa/qmail/mailnames/*.com/p/.spamassassin/user_prefs
Jun 20 16:15:19 plesk spamd[74859]: spamd: processing message <001c01cc2f5c$ddd0b100$99721300$@com> for p@*.com:110
Jun 20 16:15:19 plesk spamd[74859]: spamd: clean message (-100.0/7.5) for p@*.com:110 in 0.2 seconds, 209776 bytes.
Jun 20 16:15:19 plesk spamd[74859]: spamd: result: . -100 - USER_IN_WHITELIST scantime=0.2,size=209776,user=paul@*.com,uid=110,required_score=7.5,rhost=localhost,raddr=127.0.0.1,rport=/tmp/spamd_full.sock,mid=<001c01cc2f5c$ddd0b100$99721300$@com>,autolearn=ham
Jun 20 16:15:19 plesk qmail-local-handlers[95476]: handlers_stderr: PASS
Jun 20 16:15:19 plesk qmail-local-handlers[95476]: call_handlers: PASS during call '/usr/local/psa/handlers/info/10-spam-NOG1jB/executable' handler
Jun 20 16:15:20 plesk spamd[85686]: prefork: child states: II
Jun 20 16:15:20 plesk qmail: 1308582920.017710 delivery 30082: success: did_0+0+2/
Jun 20 16:15:20 plesk qmail: 1308582920.017812 status: local 0/100 remote 0/100
Jun 20 16:15:20 plesk qmail: 1308582920.017877 end msg 39144980

It looks to me to have been delivered? However the email didn't arrive in the mailbox.

I'd really appreciate some guidance; does anyone have any thoughts?

Many thanks!
Andy