Understanding procmail error

I am getting this error whenever getmail passes messages to procmail:

procmail: Opening "/home/richard/.pmdir/log")
  msg 2/2 (2358 bytes) from <[email protected]>, delivery error (command
procmail 21157 wrote to stderr: procmail: [21157] Mon Jan 24 12:53:58 2011

It's a bit sparse on details, so I was hoping someone could help me decipher
it. Any help would be greatly appreciated.

Here's what my log file says:

procmail: Assigning "INCLUDERC=/home/richard/.pmdir/recipes"
procmail: Assigning "FROM="
procmail: Match on "^FROM:.*"
procmail: Assigning "MATCH="
procmail: Matched "Richard Reina <[email protected]>"
procmail: Match on "^From:[    ]*\/[^  ].*"
procmail: Assigning "FROM=Richard Reina <[email protected]>"
procmail: Assigning "SUBJECT="
procmail: Match on "^FROM:.*"
procmail: Assigning "MATCH="
procmail: Matched "testing random"
procmail: Match on "^Subject:[    ]*\/[^  ].*"
procmail: Assigning "SUBJECT=testing random"
procmail: Executing " /usr/bin/perl -e 'require "/home/richard/.pmdir/
test_subject.pl"; test_subject($ENV{SUBJECT});'"
procmail: Match on " /usr/bin/perl -e 'require "/home/richard/.pmdir/
test_subject.pl"; test_subject($ENV{SUBJECT});'"
procmail: Match on ! "(^(Mailing-List:|Precedence:.*(junk|bulk|list)|To:
Multiple recipients of |(((Resent-)?(From|Sender)|X-Envelope-From):|>?From
)([^>]*[^(.%@a-z0-9])?(Post(ma?(st(e?r)?|n)|office)|(send)?Mail(er)?|daemon|m(mdf|ajordomo)|n?uucp|LIST(SERV|proc)|NETSERV|o(wner|ps)|r(e(quest|sponse)|oot)|b(ounce|bs\.smtp)|echo|mirror|s(erv(ices?|er)|mtp(error)?|ystem)|A(dmin(istrator)?|MMGR|utoanswer))(([^).!:a-z0-9][-_a-z0-9]*)?[%@>
 ][^<)]*(\(.*\).*)?)?$([^>]|$))) # if it did not come from a daemon
(automated)"
procmail: Match on ! "(^(((Resent-)?(From|Sender)|X-Envelope-From):|>?From
)([^>]*[^(.%@a-z0-9])?(Post(ma(st(er)?|n)|office)|(send)?Mail(er)?|daemon|mmdf|n?uucp|ops|r(esponse|oot)|(bbs\.)?smtp(error)?|s(erv(ices?|er)|ystem)|A(dmin(istrator)?|MMGR))(([^).!:a-z0-9][-_a-z0-9]*)?[%@>
 ][^<)]*(\(.*\).*)?)?$([^>]|$)) # if it did not come from a mailer
(automated)"
procmail: Match on ! "^X-Loop: [email protected] # did'nt come from
me (avoid loop)"
procmail: Executing "( formail -rI"From: No Reply <[email protected]>";
\
  echo "Your mail has been returned."; \
  echo "It was NOT received because it does not contain a valid PO in the
subject"; \
  echo "Please resubmit with a valid PO number in the subject line."; \
  ) | /usr/sbin/ssmtp -oi -t"
procmail: [21157] Mon Jan 24 12:54:03 2011
procmail: Assigning "LASTFOLDER=( formail -rI"From: No Reply <
[email protected]>"; \
  echo "Your mail has been returned."; \
  echo "It was NOT received because it does not contain a valid PO in the
subject"; \
  echo "Please resubmit with a valid PO number in the subject line."; \
  ) | /usr/sbin/ssmtp -oi -t"
procmail: Notified comsat: "richard@:/home/richard/mail/.inboxes/( formail
-rI"From: No Reply <[email protected]>"; \
  echo "Your mail has been returned."; \
  echo "It was NOT received because it does not contain a valid PO in the
subject"; \
  echo "Please resubmit with a valid PO number in the subject line."; \
  ) | /usr/sbin/ssmtp -oi -t"
 Subject: testing random
  Folder: ( formail -rI"From: No Reply <[email protected]>"; \
2433

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