[Question] Remove These Headers and Outlook conversation view

Eoin Kim Eoin.Kim at rcst.com.au
Fri Feb 16 02:40:41 UTC 2018

Hi Mark,

I was thinking for a while after reading your reply. I guess if I tweak the Message-ID: header,

  1.  There will be two initial points of conversation for receiver - the first email arrived with attachment stripped and the second email released from quarantine (original with attachment but Message-ID: mangled)
  2.  From that point, depending on which message the receiver replies, one conversation will grow but the other doesn't.

Am I following you? I was checking headers of this conversation (yes, this thread) and found that References: is appending something. I'm not sure if it's Message-ID: or In-Reply-To: since they are identical. If the Message-ID: is mangled and References: is actually appending Message-ID:, my imagination sounds sensible to you?


-----Original Message-----
From: MailScanner [mailto:mailscanner-bounces+eoin.kim=rcst.com.au at lists.mailscanner.info] On Behalf Of Mark Sapiro
Sent: Friday, 16 February 2018 11:58 AM
To: mailscanner at lists.mailscanner.info
Subject: Re: [Question] Remove These Headers and Outlook conversation view

On 02/15/2018 03:57 PM, Eoin Kim wrote:

> Oh, wait.


> Schlake, after Message-ID is altered, is user's Outlook still fine with conversation view? Because I am not sure which criteria is used for conversation view in Exchange server.

Probably not, but consider the alternatives for the Outlook user.

If you don't munge the Message-ID:, she doesn't see the message with

attachment. but the "conversation" threading is maintained for the

message she did receive and subsequent messages.

If you do munge the Message-ID:, she sees both the message with and the

message without the attachment and both these messages are in the

"conversation" because their References: and In-Reply-To: headers are

intact. However subsequent replies to the message are only threaded to

the message without the attachment (assuming she doesn't delete it)

because they don't reference the munged Message-ID:.

Which of those scenarios do you think she'll prefer?

Of course all the above depends on how Outlook actually does threading

in "conversation" view, and I'm only guessing about that.


Mark Sapiro <mark at msapiro.net<mailto:mark at msapiro.net>>        The highway is for gamblers,

San Francisco Bay Area, California    better use your sense - B. Dylan


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