No. SPF is designed to be secure, eg you cannot add some header to bypass the authentication, then every phisher would add such a header.
What you need to do, is to rewrite the FROM adress or encapsulate the email. Rewriting FROM adress can be as simple as rewriting yourn...@yahoo.com to yourn...@yourserver.tld , or even yourname.yahoo....@yourserver.tld Then you host a own SPF record. The disadvantage of this method, is that it will not be possible to reply or answer on emails from your google account. You could however, since you know the domain and username, manually write the correct @yahoo.com adress in the “to” field when replying to a email. Another way, is to encapsulate the email in a new message/rfc822 container, where the outer container contains like From: forwar...@yourserver.tld To: somen...@gmail.com , Subject: Fwd: Original Subject And then the inner container contains: From: yourn...@yahoo.com To: yourn...@yourserver.tld Subject: Original Subject The advantage with this method is that you can reply to the email by replying to the inner container. This is how most email clients forward email, by encapsulating them. In most cases, a email client will either show a iframe showing the original content, a button to open the mail in a new window, or a attached file that can be opened to show the mail. Of course, its important that you do publish a own SPF record. And also, its a bad idea to forward spoofed email, since this could get your domain “blacklisted” at google, thus its a good idea to SPF and/or DKIM check any incoming email on your forwarder adress before forwarding them. From: Il Neofita Sent: Thursday, September 17, 2015 7:40 PM To: postfix-users@postfix.org Subject: Forward rejected by yahoo Hi, I have the following problem if I forward an email received from yahoo to an other yahoo account the message is rejected. If I send a message from yahoo -> my server and forwarded to a google account the message is marked as spam, since is considered a spoofed. Can I fixed this adding some header? Thank you
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