On Fri, Jul 22, 2016 at 09:12:47AM -0000, John Levine wrote: > I've found that the best place to do anti-DMARC stuff is in a shim > between the list package and the sendmail program, since it can do > whatever you want to the message and it still works when you upgrade > the list software. Do you recommend this on the inbound or outbound side? That is: before the MTA hands off to the MLM, or after the MLM hands off to the MTA? ---rsk