毎回メールを送信すると2通同じメールが届きます。どうもsmtpdとpickupが同じ
メールをお互い送信しているのですが、どうしたらいいでしょうか？

Feb 14 00:18:23 localhost postfix/smtpd[13133]: connect from hostname.mydomain.com[192.168.2.125]
Feb 14 00:18:23 localhost postfix/smtpd[13133]: 828694B4023: client=hostname.mydomain.com[192.168.2.125], sasl_method=CRAM-MD5, sasl_username=user@mydomain.com
Feb 14 00:18:23 localhost postfix/cleanup[13136]: 828694B4023: message-id=<u64a6ytmd.wl%user@external.com>
Feb 14 00:18:23 localhost postfix/qmgr[9687]: 828694B4023: from=<user@external.com>, size=715, nrcpt=2 (queue active)
Feb 14 00:18:23 localhost postfix/smtpd[13133]: disconnect from hostname.mydomain.com[192.168.2.125]
Feb 14 00:18:23 localhost postfix/local[13138]: 828694B4023: to=<user2@mydomain.com>, relay=local, delay=0, status=sent (delivered to command: procmail -a "$EXTENSION")
Feb 14 00:18:23 localhost postfix/smtp[13137]: 828694B4023: to=<user@external.com>, relay=mail.provider.com[xxx.xxx.xxx.xxx], delay=0, status=sent (250 2.0.0 l1DFHTbT011071 Message accepted for delivery)
Feb 14 00:18:23 localhost postfix/qmgr[9687]: 828694B4023: removed
Feb 14 00:18:24 localhost imaplogin: LOGIN, user=user@mydomain.com, ip=[::ffff:192.168.2.125], protocol=IMAP
Feb 14 00:18:24 localhost postfix/pickup[12986]: 3A3AC4B4023: uid=1000 from=<user@mydomain.com>
Feb 14 00:18:24 localhost postfix/cleanup[13136]: 3A3AC4B4023: message-id=<u64a6ytmd.wl%user@external.com>
Feb 14 00:18:24 localhost postfix/qmgr[9687]: 3A3AC4B4023: from=<user@mydomain.com>, size=680, nrcpt=1 (queue active)
Feb 14 00:18:24 localhost postfix/local[13138]: 3A3AC4B4023: to=<user2@mydomain.com>, relay=local, delay=0, status=sent (delivered to command: procmail -a "$EXTENSION")
Feb 14 00:18:24 localhost postfix/qmgr[9687]: 3A3AC4B4023: removed