Hi, I am running Postfix version 2.5.6 on RedHat 4 and is experiencing periodic duplicated mails.The RedHat mailserver is the mailhub receiving incoming mails from the ISP and forward mails to the internal mail server. Occasionally, users are complaining receiving duplicated mails on the same day with 1-2 hours apart.Here's one of the snipped log entries on the same incoming mails being delivered twice: Oct 31 10:15:16 mailgate2 postfix/smtpd[9647]: connect from ttsenmta2.ttasia.com[210.17.183.8]Oct 31 10:15:17 mailgate2 postfix/smtpd[9647]: 4803D7F20: client=ttsenmta2.ttasia.com[210.17.183.8]Oct 31 10:15:17 mailgate2 postfix/cleanup[9648]: 4803D7F20: message-id=<002601cdb70d$8e5363e0$aafa2ba0$@com.tw>Oct 31 13:04:23 mailgate2 postfix/qmgr[4869]: 4803D7F20: from=<v...@otogarment.com>, size=595890, nrcpt=3 (queue active)Oct 31 13:04:23 mailgate2 postfix/smtp[10206]: 4803D7F20: to=<i...@ss-intl.com>, relay=192.168.1.21[192.168.1.21]:25, delay=10147, delays=10146/0/0/0.3, dsn=2.0.0, status=sent (250 Mail queued for delivery)Oct 31 13:04:23 mailgate2 postfix/smtp[10206]: 4803D7F20: to=<rick...@ss-intl.com>, relay=192.168.1.21[192.168.1.21]:25, delay=10147, delays=10146/0/0/0.3, dsn=2.0.0, status=sent (250 Mail queued for delivery)Oct 31 13:04:23 mailgate2 postfix/smtp[10206]: 4803D7F20: to=<sherry...@ss-intl.com>, relay=192.168.1.21[192.168.1.21]:25, delay=10147, delays=10146/0/0/0.3, dsn=2.0.0, status=sent (250 Mail queued for delivery)Oct 31 13:04:23 mailgate2 postfix/qmgr[4869]: 4803D7F20: removed
Oct 31 10:30:23 mailgate2 postfix/smtpd[9688]: connect from ttsenmta2.ttasia.com[210.17.183.8]Oct 31 10:30:23 mailgate2 postfix/smtpd[9688]: F097C7F1F: client=ttsenmta2.ttasia.com[210.17.183.8]Oct 31 10:30:24 mailgate2 postfix/cleanup[9689]: F097C7F1F: message-id=<002601cdb70d$8e5363e0$aafa2ba0$@com.tw>Oct 31 10:30:26 mailgate2 postfix/qmgr[4869]: F097C7F1F: from=<v...@otogarment.com>, size=595890, nrcpt=3 (queue active)Oct 31 10:30:26 mailgate2 postfix/smtpd[9688]: disconnect from ttsenmta2.ttasia.com[210.17.183.8]Oct 31 10:30:26 mailgate2 postfix/smtp[9685]: F097C7F1F: to=<i...@ss-intl.com>, relay=192.168.1.21[192.168.1.21]:25, delay=2.6, delays=2.3/0/0/0.3, dsn=2.0.0, status=sent (250 Mail queued for delivery)Oct 31 10:30:26 mailgate2 postfix/smtp[9685]: F097C7F1F: to=<rick...@ss-intl.com>, relay=192.168.1.21[192.168.1.21]:25, delay=2.6, delays=2.3/0/0/0.3, dsn=2.0.0, status=sent (250 Mail queued for delivery)Oct 31 10:30:26 mailgate2 postfix/smtp[9685]: F097C7F1F: to=<sherry...@ss-intl.com>, relay=192.168.1.21[192.168.1.21]:25, delay=2.6, delays=2.3/0/0/0.3, dsn=2.0.0, status=sent (250 Mail queued for delivery)Oct 31 10:30:26 mailgate2 postfix/qmgr[4869]: F097C7F1F: removed Can someone explain why there's a delay in delivery at 10:15:17 until 13:04? The ISP said they didn't receive the 250 OK after end of DATA and hence retry later at 10:30 which was delivered immediately. Regards,Fred​
