Paul Vixie wrote: >> - many ISPs won't let you forward or submit mail through someone >> else's SMTP server, even if you have permission to do so. so you >> can't forward your mail through your "home" ISP's mail server to >> allow the "mail from" check to work. > > in that case you'd be wise to not insert a MAIL-FROM MX for your > domain. The vast majority of users do not have the ability to make that decision. The curious thing is that it is in an ISP's best interests _not_ to implement this draft, since doing so will likely mark nomadic users' email as suspect and potentially lose a customer. Most companies only support the "public good" to the extent it doesn't cost them any revenue. S