error log postfix

"Dadang Haryadi" <dharyadi-n0s0B9URmCtWk0Htik3J/[email protected]>
Newsgroups gmane.mail.postfix.user.indonesian
Message-ID <[email protected]>
Saya kirim kelasah satu cabang di kantor kami muncul log seperti ini :

May 10 08:58:11 ns1 postfix/smtp[20465]: 7774016ED2B:
to=<kristianto-StCMwtwOMcDK3unMY4/[email protected]>, relay=127.0.0.1[127.0.0.1], delay=1,
status=sent (250 2.6.0 Ok, id=20248-09, from MTA: 250 Ok: queued as
4E9AA16ED4D)
May 10 08:58:13 ns1 postfix/smtp[20488]: connect to
jambi.wasantara.net.id[202.159.72.163]: server dropped connection without
sending the initial greeting (port 25)

Padahal kalau saya kirim ke yahoo.com dll ngga ada masalah

Pakah konfigurasi mail server kami atau yang di kantor cabang ?
Terus gimana solusinya

Salam
Dadang
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