I have the same with my own server and Yahoo, after my first announcement of switching from Gmail to my own server Yahoo sent me a message that I was blocked forever. I have SPF set up but not DKIM. I also don't have a valid cert (I'd have to renew every year). Gmail never gave me any problems though.
Yahoo apparently has procedures to deal with this but they are difficult to find. The annoying thing is that now I'm not even receiving any notification of the blocking anymore. The mail just disappears.
Btw, mail from my Drupal system also always ended up in spam. But I kept removing the spam tag and now it is just goes into regular mail.
Yahoo apparently has procedures to deal with this but they are difficult to find. The annoying thing is that now I'm not even receiving any notification of the blocking anymore. The mail just disappears.
Btw, mail from my Drupal system also always ended up in spam. But I kept removing the spam tag and now it is just goes into regular mail.