Apple mail authentication errors

I have a macbook pro with mavericks and I use Apple mail with gmail and yahoo addresses. As of the last few weeks I cannot send mail to certain addresses with small attachments without them being returned as undeliverable by gmail AND yahoo due to authentication errors in violation with DMARC policies:
Since both servers return similar errors I assume somehow my settings became corrupt but then I CAN send out the same email to most of my friends, just not to some and to those individuals, I can't send ANY email ever. Any thoughts?

Make sure when you are sending the SMTP servers are set for Gmail and Yahoo.
If you were to use your ISP's SMTP, for example Comcast is my ISP and I can use my Comcast SMTP servers to send BUT.... This can cause my messages to bounce. As security is tightened, this is seen as relaying and a tactic used by spammers.

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