I manage a few lists housed on the same server at my university. We use Listserv 16.0. The configurations for all my lists are mostly the same. In the last couple of weeks I began getting a huge increase in addresses on the daily error manitoring report for one of the lists. The increase looks like it's a yahoo/dmarc issue. Here's a typical example: Last error: 5.0.0 5.3.0 - Other mail system problem 550-'5.7.0 (SNT004-MC8F1) Unfortunately, messages from (216.145.160.112) on behalf of (YAHOO.COM) could not be delivered due to domain owner policy restrictions.' (delivery attempts: 0) Below are the configuration settings for the problem list and another list that has similar settings but is not having these problems. Can anyone suggest what I need to do: Thanks, Pat Williams Problem list: Confidential= No Subject-Tag= "TBA" Attachments= Yes Errors-To= Owner Digest= Yes,Same,Daily,00 Default-Options= SUBJECTHDR,NOACK,REPRO Auto-Delete= Yes,Semi-Auto,Delay(10),Max(100),Probe(30) Subscription= Open Send= Private Notify= Yes Reply-to= List,Respect Validate= Yes,Confirm Notebook= Yes,/var/www/html/archives/tba-l,Monthly,Public Ack= Yes Daily-Threshold= 200 Owner= [log in to unmask],[log in to unmask] No-problem list: Subject-Tag= "ACCSHE" Attachments= Yes Errors-To= Owner Digest= Yes,Same,Daily,Size(1000000) Daily-Threshold= 100,100 Default-Options= SUBJECTHDR,NOACK,REPRO Auto-Delete= Yes,Semi-Auto,Delay(10),Max(100),Probe(30) Subscription= Open Send= Private Notify= Yes Reply-to= List,Respect Validate= Yes,Confirm Notebook= Yes,/var/www/html/archives/accshe,Monthly,Public Owner= [log in to unmask] (Patrick Williams) ############################ To unsubscribe from the LSTOWN-L list: write to: mailto:[log in to unmask] or click the following link: http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTOWN-L&A=1