[LinuxBIOS] [ADMIN] Mail headers: random variations?

[Carl-Daniel Hailfinger]

Hi,

(yes, I read mail headers.) I have noticed that mails I receive via the
list can have two differing Return-Paths, depending on some random
circumstances. Both of the following header lines have been seen for
mails sent 3 seconds after each other, differing in amost nothing except
the Return-Path:

Return-Path:

Return-Path:

The Return-Path variation is independent of the original sender, I have
seen it for autogenerated commit mails as well as mails for every single
person I checked.

Is anybody else seeing this?

Regards,
Carl-Daniel

From - Thu Nov 22 19:16:34 2007
X-Account-Key: account3
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X-Mozilla-Status: 0001
X-Mozilla-Status2: 00000000
X-Mozilla-Keys:                                                                                 
Return-Path: 
X-Flags: 1001
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Date: Wed, 21 Nov 2007 15:39:17 +0100
From: Carl-Daniel Hailfinger 
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From - Thu Nov 22 19:16:34 2007
X-Account-Key: account3
X-UIDL: fceb6e1f02120862aab3a48797356394
X-Mozilla-Status: 0001
X-Mozilla-Status2: 00000000
X-Mozilla-Keys:                                                                                 
Return-Path: 
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Received: (qmail invoked by alias); 22 Nov 2007 18:11:34 -0000
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  by mx0.gmx.net (mx007) with SMTP; 22 Nov 2007 19:11:34 +0100
Received: from localhost ([127.0.0.1] helo=khepri.openbios.org)
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Date: Wed, 21 Nov 2007 16:30:56 +0100
From: Carl-Daniel Hailfinger 
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[Gregg C Levine]

Hello!
Actually yes. Numerous times. I've examined my own when they arrive from the
list. Others as well.

There must be a good reason somewhere for this issue.
> -----Original Message-----
> From: [e-mail]

[mailto:[e-mail]] On
> Behalf Of Carl-Daniel Hailfinger
> Sent: Saturday, November 24, 2007 7:17 AM
> To: LinuxBIOS
> Subject: [LinuxBIOS] [ADMIN] Mail headers: random variations?
>
> Hi,
>
> (yes, I read mail headers.) I have noticed that mails I receive via the
> list can have two differing Return-Paths, depending on some random
> circumstances. Both of the following header lines have been seen for
> mails sent 3 seconds after each other, differing in amost nothing except
> the Return-Path:
>
> Return-Path:
>
> Return-Path:
>
> The Return-Path variation is independent of the original sender, I have
> seen it for autogenerated commit mails as well as mails for every single
> person I checked.
>
> Is anybody else seeing this?
>
> Regards,
> Carl-Daniel

[Russell Whitaker]

On Sun, 25 Nov 2007, Gregg C Levine wrote:
> Hello!
> Actually yes. Numerous times. I've examined my own when they arrive from the
> list. Others as well.
>
> There must be a good reason somewhere for this issue.

My guess: more than one mail server, each programmed slightly different.

Russ

[Stefan Reinauer]

Man, you gotta have plenty of time ;-)

It's called VERP - Variable envelope return path

http://en.wikipedia.org/wiki/Variable_envelope_return_path

Every 1 of X mails is sent out with a variable header. That's a
compromise between mail server load / traffic and undeliverable mail
address detection.

No reason to worry. This is all on purpose ;-)

Stefan

* Carl-Daniel Hailfinger  [071124 13:17]:
> Hi,
>
> (yes, I read mail headers.) I have noticed that mails I receive via the
> list can have two differing Return-Paths, depending on some random
> circumstances. Both of the following header lines have been seen for
> mails sent 3 seconds after each other, differing in amost nothing except
> the Return-Path:
>
> Return-Path:
>
> Return-Path:
>
> The Return-Path variation is independent of the original sender, I have
> seen it for autogenerated commit mails as well as mails for every single
> person I checked.
>
> Is anybody else seeing this?