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seeing SRS0 in email from field

 

 

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subs at kronhead

Aug 16, 2006, 2:29 PM

Post #1 of 4 (11020 views)
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seeing SRS0 in email from field

I am an end-user, rather than an email or system admin, but I have a
decent understanding of smtp, a little understanding of spf, and a
SLIGHT understanding of srs. One thing thats not clear to me in the SRS
explanations is whether the end user should ever see the rewritten
return path in the from field, and, if not, does it depend on some
system to remove or hide it.

The reason I ask is: I get a fair amount of email at my Verizon wireless
SMS (text message) cell phone address - alerts from different sources,
notification of work assignments, etc. And some of them come in with a
weird email address - for example:
SRS0=HrNdli=BZ=ds43.reliablehosting.com=nobody [at] kronhead Generally,
these get forwarded to my phone from other addresses I use - I don't
remember exactly how this example was routed, since I have changed a lot
of things to try to get rid of this, and to solve some non-delivery
problems.

When I asked Verizon Wireless if they were familiar with SRS, and
whether they have implemented support for it - or if I was seeing this
because they had not, or because of a bad header from the sender
perhaps, their answer was "Verizon Wireless does not implement
anti-'spoofing' technology for use with our devices. In addition, we are
only able to provide information regarding features that are currently
available from us." Basically, a non answer.

Now, a newer message from the same source showed up correctly on my
phone. I don't think I changed anything in the routing - perhaps Verizon
did change something. And I should mention that I cannot see headers on
the SMS messages, so its hard to figure out whats going on.

But, my basic question is: should an end user ever see this kind of
address - can any of the scenarios of support or non-support in a
forwarding chain cause this - or is it dependent on the final receiving
system to hide these? Or is this normally only shown in smtp headers
that a user normally does not see?

Thanks
Dan Kronstadt
Shadow Hills, CA
Are you getting all your email? Free monitoring at
http://www.shserve.com/emailmon

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spf at hilotec

Aug 16, 2006, 11:32 PM

Post #2 of 4 (10410 views)
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Re: seeing SRS0 in email from field [In reply to]

Hello Dan,

> I am an end-user, rather than an email or system admin, but I have a
> decent understanding of smtp, a little understanding of spf, and a
> SLIGHT understanding of srs. One thing thats not clear to me in the
> SRS explanations is whether the end user should ever see the
> rewritten return path in the from field, and, if not, does it depend
> on some system to remove or hide it.

SRS is a feature that works on the SMTP Envelope Address of SMTP not on
the From header in the mail message. So the end user should not see the
srs in his final mail unless he looks at the headers. There he/she
would find the srs address in the Return-Path or Sender header but not
in the the From header.... .... unless the mail was sent without From
header and your MTA inserted the envelope address instead.


Regards.
Jean-Pierre

--
HILOTEC Engineering + Consulting AG
Energietechnik und Datensysteme
Tel: +41 34 402 74 00 - http://www.hilotec.com/

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subs at kronhead

Aug 17, 2006, 3:11 PM

Post #3 of 4 (10413 views)
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Re: seeing SRS0 in email from field [In reply to]

Thanks for the answer. I started to suspect that as I composed the question.

On the other hand, I just subscribed to an open office announcement list
by sending an email, and got this back as the subscribe address they
got: srs0=3fm23o=b6=kronhead.com=subs [at] yourhostingaccount I wonder
how I will unsubscribe??

Maybe they use the sender field to make sure they are not getting
spoofed subscriptions requests?

Dan

Jean-Pierre Schwickerath wrote:
> Hello Dan,
>
>
>> I am an end-user, rather than an email or system admin, but I have a
>> decent understanding of smtp, a little understanding of spf, and a
>> SLIGHT understanding of srs. One thing thats not clear to me in the
>> SRS explanations is whether the end user should ever see the
>> rewritten return path in the from field, and, if not, does it depend
>> on some system to remove or hide it.
>>
>
> SRS is a feature that works on the SMTP Envelope Address of SMTP not on
> the From header in the mail message. So the end user should not see the
> srs in his final mail unless he looks at the headers. There he/she
> would find the srs address in the Return-Path or Sender header but not
> in the the From header.... .... unless the mail was sent without From
> header and your MTA inserted the envelope address instead.
>
>
> Regards.
> Jean-Pierre
>
>

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davidnicol at gmail

Aug 18, 2006, 1:11 AM

Post #4 of 4 (10432 views)
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Re: seeing SRS0 in email from field [In reply to]

On 8/17/06, Dan <subs [at] kronhead> wrote:
>
> Thanks for the answer. I started to suspect that as I composed the
> question.
>
> On the other hand, I just subscribed to an open office announcement list by
> sending an email, and got this back as the subscribe address they got:
> srs0=3fm23o=b6=kronhead.com=subs [at] yourhostingaccount I
> wonder how I will unsubscribe??

You might have to use your understanding of SMTP and
connect to their server directly, and so on.

--
David L Nicol
Luddite! (mob of angry villagers with ray guns)

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