On Tuesday, January 13, 2026,, Cornell will make a configuration change to some Lyris E-lists to bring posts sent by email into better alignment with the upcoming DMARC security policy enforcement scheduled for Wednesday, January 28, 2026. 

This change will affect all E-lists that include non-“@cornell.edu” members and to which members post by email. The change will improve deliverability of messages to non-“@cornell.edu” addresses, which might otherwise be blocked by the DMARC policy.

The change will not affect how the Reply and Reply All options in email clients behave when responding to email posts sent through e-lists.

What Should E-list Members Expect to See After the January 12 Change?

For email from affected E-lists, after the update, members receiving email posts will see the following changes:

• The From: line—which formerly displayed an administrative “bounce” address and the email address of the “poster”—will now show the posting address of the E-list.
• An informational comment at the beginning of the email will display the name and email address of the E-List poster.

E-list Email Post Examples

For example, an email sent to the E-list “example-L@cornell.edu” by list member “ezra@cornell.edu” currently shows:

From: bounce-123456789-987654@list.cornell.edu on behalf of Ezra Cornell <ezra@cornell.edu>
Subject: Cornell was founded 1865
To: EXAMPLE-L <example-L@list.cornell.edu>
----
First line of the original email…

After the January 13, 2026, change, you can expect the same email post to look like this:

From: example-L@list.cornell.edu
Subject: Cornell was founded 1865
To: example-L@list.cornell.edu
----
(Posted by Ezra Cornell <ezra@cornell.edu>)

First line of the original email…

For More Information

To learn more about the general project to better protect Cornell email using DMARC policies, visit Cornell Moves Forward on DMARC Enforcement to Prevent Email Fraud.