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Sy ada kasus yg rada memusingkan

Client menggunakan Win7 dg. software Windows Mail
sy sudah setting email untuk client tsb.
Saat di area kantor, send n receive client normal
tapi saat client dg. notebooknya di LUAR kantor connect dg. Wireless Modem 
(Provider 3)
saat receive no problem
tapi pada saat send mail selalu terjadi error spt di bawah ini.
Dimana sy coba menggunakan port 25 dan 587 tidak bs sent dg. error yg berbeda

Ada solusi untuk masalah sy ini pak?
Mohon pencerahan.. >.<

tq
Suzy
----- Original Message ----- 
From: Marketing Crab - Ronny Triyana 
To: EDP Hw/Mail - Suzy Ariyani 
Sent: Monday, July 18, 2011 10:31 AM
Subject: Error message


The connection to the server has failed.
Subject 'my message'
Server: 'bb.ptbmi.com'
Windows Live Mail Error ID: 0x800CCC0E
Protocol: SMTP
Port: 587
Secure(SSL): No
Socket Error: 10060

An unknown error has occurred.
Subject 'my message'
Server Error: 554
Server Response: 554 Sorry, message looks like spam or phish to me (OP)
Server: 'bb.ptbmi.com'
Windows Live Mail Error ID: 0x800CCC6F
Protocol: SMTP
Port: 25
Secure(SSL): No

 
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