[ExchangeList] Re: SPF and External to External Distribution List

  • From: Chris Wall <Chris.Wall@xxxxxxxxxxxxxxxxxxx>
  • To: <exchangelist@xxxxxxxxxxxxx>
  • Date: Thu, 7 Oct 2010 12:39:46 -0400

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?




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




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)



Other related posts: