On 19/04/2016 2:50, Patrick Shanahan wrote:
* Carlos E. R. <> [04-18-16 20:17]:
On 19/04/2016 1:49, Patrick Shanahan wrote:
He could even post using is regular/previous email addr and use smtp.google.com. Then yahoo would not be messing with his list postings.
On the contrary!
Doing that makes the dmarc test to fail, unless yahoo authorizes google to do that. It works by checking some fields on the DNS for his address, ie, yahoo. And it says that if if it is not sent from a list of IPs, the mail should be discarded as false.
But he would not be sending to yahoo :) Yahoo doesn't figure in if he uses google's smtp. I can send direct from my home box that way rather than using my att.net isp, in fact I do for some addrs. List mail would not see yahoo but google. Only return posts from the list would travel thru yahoo.
It doesn't matter. At the receiving end, the server receiving sees the from: someguy@yahoo. Then it checks the dns and downloads data, which says which IP xx.yy.zz.ww are authorized to send posts in the name of yahoo. The receiving box says that it was sent from gmail. Gmail is not in the authorized list for yahoo, thus the mail is false. Discard it. This is called "dmarc" tests. See wikipedia. See the link posted several times which explains why it kills mail lists. It is the same thing: his post "from" yahoo is seen to come from opensuse.org, thus it has to be false. It claims to be "from" yahoo but it is not. Even though it really is! It is a method, enforced on the destination server, to check if the email was "really" sent by the person listed in the "from" address. It does not verify the person, but the domain. If a person has a yahoo address, it MUST be sent by a yahoo server, or it is false. So if you send from your home server, or via google, it is detected that you did that, and it is not valid. -- Saludos/Cheers, Carlos E.R. (Minas-Morgul - W10) -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-factory+owner@opensuse.org