stop outgoing mails classified as spam (postfix, spamass)
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Sorry, I probably mistook the OPs question as outbound rejections. I see the OP probably means, as billymayday suggests, mail is accepted, but placed in various user's spam/junk folders. The headers would be most appropriate.
The inbound smtpd connection accepts the the users mail mail from his MTA. Then, smtp relays the mail elsewhere. Why remote servers classify this configuration as SPAM requires further investigation. All the mail headers would be relevant and useful. A properly configured mail server should not give trouble based on how a user's submits mail for delivery. But some do, they inspect the headers for Received headers that appear to come from certain ranges.