How can I improve my email deliverability through Google Apps?
thinkbohemian: Does the problem happen with all email accounts or just some? (microsoft servers such as live.com and hotmail.com notoriously delete and reject valid emails when others do not).Besides spf, make sure that you comply with can-spam guidelines. Ensure that your DNS entries are correct and that the url that you are sending from @example.com resolves to the same ip address as that url example.com.  Here is some more info http://postmaster.msn.com/Guidelines.aspx . I had to add sender ID to my dns to get hotmail to accept forwarded messages from my disposable email service http://whyspam.mehttp://www.microsoft.com/mscorp/safety/technologies/senderid...get back with some more info, and i'll help you troubleshoot, seeing as how email is my current specialty.