Dear pak Syafril

Selamat pagi, pak saat ini beberapa user kami menerima mail return dengan
pesan seperti ini,

Reporting-MTA: dns; mx3.ntt.net.id
X-Postfix-Queue-ID: 2C12C405A31
X-Postfix-Sender: rfc822; ganda.pu...@id.yusen-logistics.com
Arrival-Date: Tue, 22 Apr 2014 08:52:28 +0700 (WIT)

Final-Recipient: rfc822; l...@systempro.asia
Original-Recipient: rfc822;l...@systempro.asia
Action: failed
Status: 5.7.1
Remote-MTA: dns; aspmx.l.google.com
Diagnostic-Code: smtp; 550-5.7.1 [2404:c8:0:2000:0:1:0:2139      12] Our
system
    has detected that this 550-5.7.1 message is likely unsolicited mail. To
    reduce the amount of spam sent 550-5.7.1 to Gmail, this message has been
    blocked. Please visit 550-5.7.1
    http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for 550
    5.7.1 more information. g7si21798624pad.35 - gsmtp

Ini pengertian nya apa ya pak? Tapi ini hanya terjadi pada beberapa alamat
recipient saja yang mengalami hal seperti ini.
Mohon advice nya pak.

Terima kasih.

Ganda Putra
------------------------------------------
IT Section

Soewarna Business Park Block A Lot 1-2
Soekarno-Hatta International Airport
Jakarta - Indonesia
Tel : 62-21-55912914 ext. 272
Fax : 62-21-5502033
e-Mail : ganda.pu...@id.yusen-logistics.com



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