Wietse Venema wrote > That information is already available from the Postfix maillog file.
My first attempt at solving this actually relied on going through the log file to find the client IP, but I found out that the line containing "client=..." was frequently missing. If I grep the log file for a mail ID, I often just find "to=" and "from=" lines, and no lines containing "client=". -- View this message in context: http://postfix.1071664.n5.nabble.com/Is-there-any-documentation-on-the-binary-format-of-the-mail-files-under-var-spool-postfix-tp90656p90661.html Sent from the Postfix Users mailing list archive at Nabble.com.