Message rejected due to: SPF fail - not authorized
I've sent an email and received the message below (changer receivers address with "x"). This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: [email protected] host mx.rompetrol.ro [184.108.40.206] SMTP error from remote mail server after RCPT TO:: 550 5.7.1 : Recipient address rejected: Message rejected due to: SPF fail - not authorized. Please see http://www.openspf.net/Why?s=mfrom;[email protected];ip=2xx.1xx.1xx.1xx;[email protected] What can I do to solve this problem?