Where is the "To:" in the headers with multiple re cipients?

Shmulik_Gazit · March 24, 2003, 9:02am

You are right!!!
After talking with the ISP who installed POPBeamer it turned out that it has
problems if there is more than one recipient BCCed.
We’ll have to upgrade our mail-relay solution.
I can’t believe I waisted a the good part of a month agonizing on this.

Thank you!

/Shmulik.-----Original Message-----
From: Martin Schapendonk [mailto:martin.schapendonk@whitehorses.nl]
Sent: Mon, March 24, 2003 9:59 AM
To: Rt-Users (E-mail)
Subject: RE: [rt-users] Where is the “To:” in the headers with multiple
recipients?

Hi,

As you can see, there is no TO: field, so when the POPBeamer gets

the mail,

it doesn’t have an address to send it to, and it fails to deliver.

When I send to two recipients on hotmail, both get the mail, so it is

probably something that is getting lost between RT (RedHat 7.3

with default

sendmail) and the mail-relay.

Sounds like POPBeamer is not behaving how it should. A To-header is not
necessary in an email, just an envelope address is required for an MTA to
deliver an email.

POPBeamer presumably also doesn’t handle Bcc?

Cheers,

Martin

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Shmulik_Gazit · March 24, 2003, 9:09am

This is the KB item from POPBeamer’s KB.
Can you tell me if it’s RT that is doing something that is not standard, or
how can I make it, according to this KB, that it will be solved until we
upgrade?

The KB item:

KBPB017

Symptoms:
BCC addresses are not properly auto detected and routed.

Cause:
The handling of BCC addresses depends on the information that the ISP adds
to the header of the message.
I your ISP does not add the address of the final recipient somewhere in the
header of the message, then POPBeamer can not route it.
Like a normal letter, an email consist of a envelope and the messageitself.
An email is routed based on the information on the envelope, exactly the
same as a normal letter.

When your ISP gets the message is discards the envelope and puts only the
message into the POP3 mailbox. POPBeamer then downloads the message and it
needs to recreate the envelope from the header of the message.

For To: and CC: addresses the sender of the message adds the address to the
header and so such messages are no problem for POPBeamer.

However, in the case of a BCC the sender does not add the email address into
the header of the message ( or else it would not be a Blind Carbon Copy )
and so the ISP needs to add it or POPBeamer has not enoughinformation to
route the message properly.

Luckily nearly all ISP add the email addresses somewhere and themost common
is place where they add it is the Received: line which looks something like
this:

Received: by smtp.yourisp.com
with SomeProgram v1.00
for user@yourdomain.com ;
Tue, 1 Jan 2002 10:49:21 +0100

Other common lines which POPBeamer scans are:

Resent-To: user@yourdomain.com
Apparently-To: user@yourdomain.com
Envelope-to: user@yourdomain.com
X-RCPT-TO: user@yourdomain.com
Delivered-To: user@yourdomain.com

Thanks!
/Shmulik.-----Original Message-----
From: Shmulik Gazit [mailto:Shmulik@olivesoftware.com]
Sent: Mon, March 24, 2003 11:02 AM
To: ‘Martin Schapendonk’
Cc: Rt-Users (E-mail)
Subject: RE: [rt-users] Where is the “To:” in the headers with multiple
re cipients?