I'm getting the following in my mail logs on my app server:
550-5.7.1 [18.104.22.168] The IP you're using to send mail is not authorized to 550-5.7.1 send email directly to our servers. Please use the SMTP relay at your 550-5.7.1 service provider instead. Learn more at 550 5.7.1 http://support.google.com/mail/bin/answer.py?answer=10336
I've checked and the IP is not listed on any PBL/SBL/etc that I know of. The domain name in the FROM: email address is a CNAME to our app server's primary domain (djangostage.farstarserver.com). We have a PTR record for the server's IP, so reverse DNS resolves to the same domain (djangostage.farstarserver.com). We also have the following SPF record set up for the domain to allow our vhost domains on that server to send email under their own domains:
"v=spf1 a a:django.farstarserver.com -all"
Any ideas why Google is blocking our server?