> Kok aneh, errornya 651? Bukan 501 ya?
> Coba periksa ke smtp-in log, cari transaksi dari user itu agar tahu
> error persisnya apa.

Error 501 juga pernah saya temui di user lain Pak.
Setelah saya check log SMTP in
hasilnya begini :
Wed 2012-10-31 17:41:31: <-- DATA
Wed 2012-10-31 17:41:31: Creating temp file (SMTP): 
c:\mdaemon\queues\temp\md50000034798.tmp
Wed 2012-10-31 17:41:31: --> 354 Enter mail, end with <CRLF>.<CRLF>
Wed 2012-10-31 17:41:31: Message size: 2446 bytes
Wed 2012-10-31 17:41:31: Passing message through AntiVirus (Size: 2446)...
Wed 2012-10-31 17:41:31: *  Message is clean (no viruses found)
Wed 2012-10-31 17:41:31: ---- End AntiVirus results
Wed 2012-10-31 17:41:31: Passing message through Spam Filter (Size: 2446)...
Wed 2012-10-31 17:41:34: c:\mdaemon\queues\temp\md50000034798.tmp
Wed 2012-10-31 17:41:34: An error occured during Spam Filter processing
Wed 2012-10-31 17:41:34: --> 451 Sorry, try later.  Spam Filter unavailable.
Wed 2012-10-31 17:41:37: <-- QUIT
Wed 2012-10-31 17:41:37: --> 221 See ya in cyberspace
Wed 2012-10-31 17:41:37: SMTP session terminated (Bytes in/out: 54087/2616)

Diatas ada error 451, bukan 651 atau 501 tapi kata-katanya sama.

> Mestinya sih mail dari authenticate sender bypass spam filter, coba
> diperiksa setting berikut

> http://mdaemon.dutaint.co.id/13.0/index.html?sf_options.htm

> Don't filter mail from...
> [x] trusted or authenticated sources

Setelah coba cara ini saya tidak temukan error seperti di Log atas di SMTP 
in
berikut hasilnya :
Wed 2012-10-31 17:41:42: <-- DATA
Wed 2012-10-31 17:41:42: Creating temp file (SMTP): 
c:\mdaemon\queues\temp\md50000034801.tmp
Wed 2012-10-31 17:41:42: --> 354 Enter mail, end with <CRLF>.<CRLF>
Wed 2012-10-31 17:41:42: Message size: 890 bytes
Wed 2012-10-31 17:41:42: Passing message through AntiVirus (Size: 890)...
Wed 2012-10-31 17:41:42: *  Message is clean (no viruses found)
Wed 2012-10-31 17:41:42: ---- End AntiVirus results
Wed 2012-10-31 17:41:43: Message creation successful: 
c:\mdaemon\queues\inbound\md50001366908.msg
Wed 2012-10-31 17:41:43: --> 250 Ok, message saved <Message-ID: 
007801cdb754$265e9100$731bb300$@com>
Wed 2012-10-31 17:41:45: <-- QUIT
Wed 2012-10-31 17:41:45: --> 221 See ya in cyberspace
Wed 2012-10-31 17:41:45: SMTP session successful (Bytes in/out: 2671/754)

Mungkin cara ini berhasil Pak. Coba saya lihat beberapa hari kedepan apakah 
ada user yang complaint lagi tidak bisa send Email. Terima Kasih Pak Syafril 
atas bantuannya.

Regards,

Sukardy
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