I have a postfix mailserver running. Mails sent from users to Gmail are showing up in Gmail, so it works in general. Same for all other freemail hosts I know.
The problem is that some users have no local mailbox but a forwarding to Gmail. If someone sends a mail to such a user my mail server forwards the mail to Gmail. This works, even if the original domain has a SPF record with "-all". But if a Gmail users sends a mail to my server which is then forwarded to Gmail again the mail never shows up in Gmail.
I already tried: - Check the logs. Gmail SMTP just reports "OK" but the mail seems to get discarded in a later step. - Enable SRS. Still no mail in Gmail
Anyone out there who has a running setup able to forward mails from Gmail to Gmail? Is there something I am missing that's causing Google to classify my mail as spam so badly that it doesn't even go to the Spam folder?