Nov 28 22:04:40 derfy policyd-spf[6328]: None; identity=helo; client-ip=63.247.131.50; helo=dwagon.erfworld.com; envelope-from=info@erfworld.com; receiver=paypal@derfy.net
Nov 28 22:04:40 derfy policyd-spf[6328]: Fail; identity=mailfrom; client-ip=63.247.131.50; helo=dwagon.erfworld.com; envelope-from=info@erfworld.com; receiver=paypal@derfy.net
Nov 28 22:04:40 derfy postfix/smtpd[6322]: NOQUEUE: reject: RCPT from unknown[63.247.131.50]: 550 5.7.1 <info@erfworld.com>: Sender address rejected: Message rejected due to: SPF fail - not authorized. Please see http://www.openspf.org/Why?s=mfrom;id=i ... derfy.net; from=<info@erfworld.com> to=<paypal@derfy.net> proto=ESMTP helo=<dwagon.erfworld.com>
Just a heads up - you may need to tweak your SPF record.
