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How to clear deferred messages from Postfix Queue

Today I was watching the log file from Postfix (in CentOS 6.X default is /var/log/maillog) and saw a lot of messages being deferred.

Jan 5 15:02:03 vps3 postfix/smtp[27441]: 3187E2180015: to=<undesired@domain.com>, relay=domain.com[167.114.XXX.XXX]:25, delay=254553, delays=254538/0.2/15/0, dsn=
4.4.2, status=deferred (conversation with domain.com[167.114.XXX.XXX] timed out while receiving the initial server greeting)
Jan 5 15:02:03 vps3 postfix/smtp[27442]: CDED02180014: to=<undesired@domain.com.br>, relay=domain.com[167.114.XXX.XXX]:25, delay=258753, delays=258738/0.13/15/0, dsn
=4.4.2, status=deferred (conversation with domain.com[167.114.XXX.XXX] timed out while receiving the initial server greeting)
Jan 5 15:02:03 vps3 postfix/smtp[27443]: C8EE72180012: to=<undesired@domain.com.br>, relay=domain.com[167.114.XXX.XXX]:25, delay=258753, delays=258738/0.14/15/0, dsn
=4.4.2, status=deferred (conversation with domain.com[167.114.XXX.XXX] timed out while receiving the initial server greeting)
Jan 5 15:02:03 vps3 postfix/smtp[27444]: CDCE32180013: to=<undesired@domain.com.br>, relay=domain.com[167.114.XXX.XXX]:25, delay=258753, delays=258738/0.15/15/0, dsn
=4.4.2, status=deferred (conversation with domain.com[167.114.XXX.XXX] timed out while receiving the initial server greeting)

and these messages did repeat from time to time.

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