L-Soft has noticed a sudden change in DMARC behavior at aol.com. The problem is not with aol.com or aim.com addresses but with *@netscape.net addresses. AOL owns and handles mail for *@netscape.net via the same mail servers as for aol.com, aim.com, etc. From the LISTSERV log: 22 Sep 2016 19:23:19 Processing mail from [log in to unmask] for EXAMPLE DMARC> v=DMARC1; p=none; pct=100; rua=mailto:[log in to unmask]; ruf=mailto:[log in to unmask]; But then we got a bunch of these: 5.2.1 521 5.2.1 : (DMARC:AOL) This message failed DMARC Evaluation for an AOL Domain. For more information please visit http://postmaster-blog.aol.com/2014/04/22/aol-mail-updates-dmarc-policy-to-reject/ LISTSERV is behaving correctly (i.e. NOT re-writing the From: address) because the DMARC record for *@netscape.net is 'p=none' instead of 'p=reject'. However the mail servers at aol.com have recently been told to apply the AOL DMARC policy to *@netscape.net addresses resulting in sudden deletions. This has changed on 9/22 or 9/23. Mail from 9/21 and earlier was delivered successfully. This problem needs to be corrected by AOL/Netscape, but fortunately there is a workaround for users of LISTSERV version 16.0-2014b (Build-Date: of your LISTSERV instance must be 8 May 2014 or later). This version does an automatic lookup of DMARC policy record on all incoming From: domains. Domains with a policy of of p=reject or p=quarantine will have the From: address re-written, as detailed previously. However, you can set a site configuration variable to force a rewrite of *@netscape.net and other problematic domains: Windows: (site.cfg) DEBUG_DMARC_REWRITE=netscape.net Unix: (go.user) DEBUG_DMARC_REWRITE="netscape.net" export DEBUG_DMARC_REWRITE A restart of the LISTSERV service is needed with any change to site configuration variables. This can also be set via the WWW interface. We hope you find this information helpful. -- __________________________________________________________________ Ben Parker . . . . . . . . . . . . . . . L-Soft international Inc. [log in to unmask] . . . . . . . . . . Chief Corporate Consultant There is only one LISTSERV® -- the product that launched the email list communication industry in 1986. L-Soft is pleased to be the only provider of LISTSERV® brand email list communication solutions, with 30 years of proven reliability. ############################ To unsubscribe from the LSTSRV-L list: write to: mailto:[log in to unmask] or click the following link: http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTSRV-L&A=1