Syafril Yth,
Tuesday, April 24, 2001, 5:53:14 PM, Sampeyan mengatakan:
> Benar.
> Dalam hal parsing addressnya salah, errornya adalah "parsing error"
> (bukan failure notice...ini bukan default errornya Mdaemon, kecuali
> jika sudah di customize oleh postmasternya, tp saya meragukan hal
> itu).
Kalau salah parsing setahu saya masuk direktori bad
message. Di sini mungkin bukan salah parsing. Tapi
proses parsing menempatkan email pada kategori remote
recipient. Ini saya quote dokumentasi DomainPOP.
"This feature works by using the POP protocol to
download all the mail found in the ISP�s POP mailbox associated with the
specified logon. Once collected, the messages are parsed according to the settings
provided
on this dialog and then placed in user mailboxes or the remote mail queue for MDaemon
to deliver, just as if the messages had arrived at the server using conventional SMTP
transactions."
- Ada istilah JUST AS IF
- Ada kalimat OR THE REMOTE MAIL QUEUE ...
Kalau langsung ditempatkan ke remote mail queue kan
artinya tidak melewati ketentuan relay, bukannya
pemeriksaan hak relay terjadi saat transaksi SMTP
(sebelum message benar-benar diterima server)?
Memang kalau tidak bisa ditempatkan ke salah satu
mailbox lokal bukan berarti otomatis masuk remote queue.
Mungkin tergantung setting. Ini saya quote lagi.
"When MDaemon downloads a message from a remote POP source it immediately parses all
the
relevant headers within that message and builds a collection of potential recipients.
Every
email address found in the headers that MDaemon inspects is included in the collection.
Once this process is complete, MDaemon�s collection of recipients is divided into
local and
remote sets. Further, all addresses that are parsed and placed into the collection of
potential
recipients are processed through the Address Alias translator before being divided into
local and remote sets. Every member of the local set (addresses with a domain that
matches
either MDaemon�s Primary domain or one of the Secondary domains) will receive a copy
of the message.
WHAT HAPPENS TO THE REMOTE SET is governed by the settings in this dialog.
You can elect to simply ignore these addresses, forward a summary listing of them to
the
postmaster, OR HONOR THEM�in which case MDaemon will actually deliver a copy of the
message to the remote recipient. Only under rare circumstances would the need to
deliver
these messages to remote recipients be warranted."
Jadi dugaan saya, kasus ini secara tidak sengaja masuk
_rare circumstances_ ini, karena meng-HONOR message
dari milis yang karena kharakter email dari milis
menyebabkan dia dikategorikan remore recipient.
Mengenai kemungkinan looping mail ini dokumentasi
mengatakan.
"Care must be taken to prevent duplicate messages or endlessly looping mail delivery
cycles.
A common problem that results from the loss of the SMTP envelope manifests itself with
mailing list mail. Typically, messages distributed by a mailing list do not contain
within the
message body any reference to the addresses of the recipients. Rather, the list engine
simply
inserts the name of the mailing list into the TO: field. This presents an immediate
problem:
if the TO: field contains the name of the mailing list then the potential exists for
MDaemon to download this message, parse the TO: field (which will yield the name of the
mailing list), and then dispatch the message right back to the same list. This would
in turn
deliver another copy of the same message back to the POP mailbox from which
MDaemon downloaded the original message�thus starting the whole cycle over again. To
cope with such problems mail administrators must take care to use the tools and
settings
that MDaemon provides to either delete mailing list mail or perhaps alias it in such a
way
that it will be delivered to the proper local recipient(s). You could also utilize the
Routing
Rules or Content Filters to deliver the message to the
correct recipient(s)."
Paragraf di atas tidak menyebut relaying security
system untuk menghindari looping. Tapi alias, routing
rules dan filter.
Dalam kasus ini kan looping tidak sampai terjadi
seperti ilustrasi di atas, karena qmail di pau-mikro
bisa mencegah looping dari deteksi header mail.
--
Salam
sanuri
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