We help IT Professionals succeed at work.
Get Started

Rewrite From: address field with Exchange 2010 Transport Server

Last Modified: 2014-05-03
Non profit organization using Exchange 2010
Getting a lot of "Message rejected due to DMARC policy"  NDR's back

We use Exchange 2010 Distribution Lists extensively with most entries on them being Contacts in Exchange/AD going to personal email addresses (AOL, Gmail, etc.)

Here's what a sample distribution list looks like:

A member of the list might Reply to an email sent from the list.  The reply would be to DistributionList1@domain.org and "From"  that person, say Someone@yahoo.com.

DMARC is in play now and it looks like Yahoo has set theirs to "Reject" and that's the reason I'm getting the NDR.   The "From" field in the email show Someone@yahoo.com and "Resent" from DistributionList1@domain.org.

Looks like the "From" address is the problem with DMARC.  The receiving SMTP server looks at the From address, looks at our IP as we sent it and sees using DMARC/DKIM/SPF that we aren't an authorized email server for "@yahoo.com".  And I get the NDR email in return.  

It looks like I can rewrite the "From:" address using Exchange 2010 Transport Server role to be from our domain.  As in   From:  DistributionList1@domain.org.  Then our DMARC policy and DKIM and SPF would all be happy.

So, how do I rewrite the From: address with Transport Server?   I guess I would see the incoming email arriving at our Exchange server with To: showing DistributionList1@domain.org and then rewrite the From: to be From: DistributionList1@domain.org before sending it out of Exchange.

I can't quite figure it out looking at the Microsoft TechNet hits I get in Google.
Some initial help and steering would be appreciated.
Watch Question
IT Director
This problem has been solved!
Unlock 2 Answers and 6 Comments.
See Answers
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE