On Sunday 29 March 2015 10:43:06 Will Hill wrote:

I keep getting bounce warnings from this list, apparently because of a problem with Yahoo. The bounce messages say,

"host gmail-smtp-in.l.google.com[74.125.70.26] said:     550-5.7.1 Unauthenticated email from yahoo.com is not accepted due to domain's 550-5.7.1 DMARC policy. Please contact administrator of yahoo.com domain if 550-5.7.1 this was a legitimate mail. Please visit 550-5.7.1 http://support.google.com/mail/answer/2451690 to learn about DMARC 550 5.7.1 initiative. ro6si3093371igb.36 - gsmtp (in reply to end of DATA command)"

It is not your problem, its yahoo's. If enough people yell at or about their broken DMARC, maybe they will fix it Their attitude seems to be that the whole world should be running it. Few others of yahoo's size are running it, and certainly not the broken yahoo version. FWIW, it did not cut the spam from yahoo servers by a noticeable amount here. They have about as many compromised machines as ever. Most of which I send to /dev/null with mailfilter before fetchmail even sees it. I suspect they may have in their IT staff, one or more admins that are making side money by posting spam, and sanitizing the logs immediately.

Thats pretty hard to detect unless you walkin on them in the act.

Cheers, Gene Heskett