Something

Apr 10 06:26:01 nbgcmx01 postfix/qmgr[18379]: CBF8928C61C: from=<>, size=11354, nrcpt=1 (queue active)
Apr 10 06:26:01 nbgcmx01 postfix/qmgr[18379]: B377128C178: removed
Apr 10 06:26:01 nbgcmx01 postfix/smtp[2411]: CBF8928C61C: to=<shu-fan@bart.nl>, relay=mailhub-new.vianetworks.nl[212.61.15.154], delay=0, status=deferred (host mailhub-new.vianetworks.nl[212.61.15.154] said: 452 Insufficient system storage (in reply to MAIL FROM command))
Apr 10 06:26:02 nbgcmx01 postfix/smtpd[2408]: disconnect from ppp78-36-130-29.pppoe.novgorod.dslavangard.ru[78.36.130.29]
Apr 10 06:26:03 nbgcmx01 postfix/qmgr[18379]: 8DDE928C178: from=<charlestonsaro@studio18b.com>, size=895, nrcpt=1 (queue active)
Apr 10 06:26:03 nbgcmx01 postfix/local[2248]: 8DDE928C178: to=<brian@nbgc.org>, orig_to=<brian.wright@nbgc.org>, relay=local, delay=1, status=bounced (unknown user: "brian")
Apr 10 06:26:03 nbgcmx01 postfix/qmgr[18379]: 989ED28C635: from=<>, size=2751, nrcpt=1 (queue active)
Apr 10 06:26:03 nbgcmx01 postfix/qmgr[18379]: 8DDE928C178: removed
Apr 10 06:26:17 nbgcmx01 postfix/smtpd[2408]: warning: 78.42.47.73: hostname HSI-KBW-078-042-047-073.hsi3.kabel-badenwuerttemberg.de verification failed: Name or service not known
Apr 10 06:26:17 nbgcmx01 postfix/smtpd[2408]: connect from unknown[78.42.47.73]
Apr 10 06:26:19 nbgcmx01 postfix/smtpd[2408]: D492228C178: client=unknown[78.42.47.73]
Apr 10 06:26:20 nbgcmx01 postfix/smtp[2411]: 989ED28C635: host rcom-outblaze-com.mr.outblaze.com[208.36.123.50] said: 452 Insufficient system storage (in reply to MAIL FROM command)
Apr 10 06:26:20 nbgcmx01 postfix/smtp[2411]: 989ED28C635: to=<charlestonsaro@studio18b.com>, relay=rcom-outblaze-com.mr.outblaze.com[205.158.62.207], delay=17, status=deferred (host rcom-outblaze-com.mr.outblaze.com[205.158.62.207] said: 452 Insufficient system storage (in reply to MAIL FROM command))
Apr 10 06:26:21 nbgcmx01 postfix/qmgr[18379]: D492228C178: from=<seamanshipuam51@quailcountry.com>, size=929, nrcpt=1 (queue active)
Apr 10 06:26:21 nbgcmx01 postfix/local[2248]: D492228C178: to=<phil@nbgc.org>, orig_to=<phil.jensen@nbgc.org>, relay=local, delay=2, status=sent (delivered to mailbox)
Apr 10 06:26:21 nbgcmx01 postfix/qmgr[18379]: D492228C178: removed
Apr 10 06:26:22 nbgcmx01 postfix/smtpd[2408]: disconnect from unknown[78.42.47.73]