Mails generated aby app being marked as spam for gmail users

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http://www.linuxquestions.org – Hi All, I configured my own mail server using sendmail for our application . Mail server is used to send automated mails when a user registers at our site . I was able to implement this successfully, but users who are registering using gmail account , automated mail message for registration are being marked as spam. This is not a issue for yahoo users. Following can be seen in message header of the mail marked as spam. Quote: Received-SPF: neutral (google.com: 103.x.x.x is neither permitted nor denied by best guess record for domain of [email protected]) client-ip=10 (HowTos)