buenas tardes , me esta marcando esto cuando mando a algunas direcciones de email ,ya que con otras no tengo problema, uso sendmail
An SPF-enabled mail server rejected a message that claimed an envelope sender address of victorv@aagjc.com.mx.
An SPF-enabled mail server received a message from mail.aagjc.com.mx (189.254.21.4) that claimed an envelope sender address of victorv@aagjc.com.mx.
However, the domain aagjc.com.mx has declared using SPF that it does not send mail through mail.aagjc.com.mx (189.254.21.4). That is why the message was rejected.
If you are victorv@aagjc.com.mx:
aagjc.com.mx should have given you a way to send mail through an authorized server.