[CentOS] Email Problem

Fri Feb 26 15:52:34 UTC 2010
John Doe <jdmls at yahoo.com>

From: Susan Day <suzieprogrammer at gmail.com>
>[root]# telnet mail.mydomain.com 25
>Trying 209.216.9.56...
>Connected to mail.mydomain.com.
>Escape character is '^]'.
>220 mail.mydomain.com ESMTP
>HELO mail.mydomain.com
>250 mail.mydomain.com
>MAIL FROM suzie at mydomain.com
>250 ok
>RCPT TO suzieprogrammer at gmail.com
>250 ok
>DATA testing
>354 go ahead
>.
>250 ok 1267194591 qp 11432
>>quit
>221 mail.mydomain.com
>Connection closed by foreign host.
>[root]# 
>I didn't receive any message. Time for domainkeys?

Hum... maybe Google checks if the reverse dns matches...
Or maybe check http://www.openspf.org/SPF_Record_Syntax

JD