[ExchangeList] Re: SPF and External to External Distribution List
- From: "Joseph King" <joseph.king@xxxxxxxxxx>
- To: <exchangelist@xxxxxxxxxxxxx>
- Date: Thu, 7 Oct 2010 12:20:44 -0700
And that?s the problem. SPF is set to only server ?x? is allowed to send on
behalf of gmail. Since this is a setting in Google?s DNS, you?re not going
to be able to get around that.
You have to send out as ?@contoso.com? with a reply-to of the original
sender (just like you were doing) to insure delivery. You would probably be
better served with a listserv service than trying to do this with Exchange.
In Your Service,
Joseph King, MCSE
<http://www.linkedin.com/in/joking> http://www.linkedin.com/in/joking
<http://www.joking.net/> http://www.joking.net
From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of David Sierra
Fernández
Sent: Thursday, October 07, 2010 10:17 AM
To: exchangelist@xxxxxxxxxxxxx
Subject: [ExchangeList] Re: SPF and External to External Distribution List
Yes the list have our own domain name in the SMTP address.
We have SMTP address lists like list@xxxxxxxxxxx (imagine contoso as our
exchange domain) . A user of gmail user1@xxxxxxxxx write to the list and
in the list there is a contact member (user2@xxxxxxxxxxx) . This hotmail
user would receive a mail from gmail user but the gmail server detect that
it was sent by a CONTOSO mail server. The normal situation is that hotmail
drop the message or at least mark CONTOSO as a potential spammer.
Up to now we solve this thanks to other mail server (Critical Path) rather
than Exchange that changes the envelope FROM address of all the list with a
generic address (contoso-owner-list@xxxxxxxxxxx). As a result the hotmail
user notices that the sender is the gmail user but gmail servers perfectly
detects that the mail is sent indeed by CONTOSO servers and don´t drop the
mails.
We are going to deprecate the old mail server and migrate de lists to
exchange. The first tests have not been successful at all. We have no way to
tell destination servers that the mail comes from gmail but we are not
impersonating but only relying.
----------------------------------------
David Sierra
Messaging Administrator
JCYL (Spain)
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De: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] En nombre de Chris Wall
Enviado el: jueves, 07 de octubre de 2010 18:40
Para: exchangelist@xxxxxxxxxxxxx
Asunto: [ExchangeList] Re: SPF and External to External Distribution List
I would assume that your DL?s have your own domain name in the SMTP address.
If your DL?s are not assigned your SMTP domain that is listed in your SPF,
then of course they will fail.
Are you assigning different SMTP Alias?/domain names to your DL?s than what
you actually host?
Regards,
Chris
From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of David Sierra
Fernández
Sent: Thursday, October 07, 2010 12:27 PM
To: exchangelist@xxxxxxxxxxxxx
Subject: [ExchangeList] SPF and External to External Distribution List
Hello,
Perhaps some of you have this scenario in your exchange organization and I
would like to know how you accomplish it:
· We have exchange distribution lists with external members
(contacts)
· Other external users write to these list
The result is that out domain is sending mails impersonating an external
domain. If destination domain use SPF (as we do) will drop down the mails
believing we are spammers.
How do you solve this situation?
Thank you very much for your help.
----------------------------------------
David Sierra
Messaging Administrator
JCYL (Spain)
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