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Allow host to relay through postfix

Add host to network_trust file.

General valid syntax check

postfix check

Log subject, recipient and sender of emails

Add to header_checks file.

/^subject:/      INFO
/^to:/ INFO
/^from:/ INFO

Test regexp matches

postmap -q "Subject: news" regexp:/etc/postfix/rewrite_headers

Test transport file matches of addresses to transports

postmap -q "" transport