This is more a curiosity than a real need, but I was wondering why I can't modify the "From" header when sending mails between local users.
It works perfectly when sending mail out (smtp_header_checks). "sender_canonical_maps" with "local_header_rewrite_clients = permit_mynetworks, permit_sasl_authenticated" works (though it only edits the address, not the 'name' in the From) Just in case something was interfering I reused the same file as with smtp_header_checks and removed other options. # postconf 'smtp_header_checks = ' 'sender_canonical_maps = ' 'virtual_alias_maps = ' 'local_header_rewrite_clients = permit_inet_interfaces' # postconf 'header_checks = pcre:/etc/postfix/smtp_header_checks' # cat /etc/postfix/smtp_header_checks /^Received:/ IGNORE /^From: .*root/ REPLACE From: "postmaster" <use...@mydomain.net> /^Subject: hello/ REPLACE Subject: bye # postfix reload # echo a | mail -s hello user01 Result: "Received" header is removed, Subject is changed, but From is unchanged... I do realize that to implement this properly I would probably have define a second cleanup service that applies to the pickup, submission and smtps services, but as I said, this is more of a curiosity/obsession at this point. Thanks in advance. postfix version: 2.10.1 cleanup -v log: postfix/cleanup[5793]: name_mask: all postfix/cleanup[5793]: inet_addr_local: configured 2 IPv4 addresses postfix/cleanup[5793]: inet_addr_local: configured 2 IPv6 addresses postfix/cleanup[5793]: process generation: 606 (606) postfix/cleanup[5793]: name_mask: envelope_sender postfix/cleanup[5793]: name_mask: envelope_recipient postfix/cleanup[5793]: name_mask: header_sender postfix/cleanup[5793]: name_mask: header_recipient postfix/cleanup[5793]: name_mask: envelope_sender postfix/cleanup[5793]: name_mask: header_sender postfix/cleanup[5793]: name_mask: envelope_recipient postfix/cleanup[5793]: name_mask: header_recipient postfix/cleanup[5793]: dict_open: pcre:/etc/postfix/smtp_header_checks postfix/cleanup[5793]: name_mask: envelope_sender postfix/cleanup[5793]: name_mask: header_sender postfix/cleanup[5793]: name_mask: header_recipient postfix/cleanup[5793]: match_string: fast_flush_domains ~? debug_peer_list postfix/cleanup[5793]: match_string: fast_flush_domains ~? fast_flush_domains postfix/cleanup[5793]: name_mask: canonical postfix/cleanup[5793]: name_mask: virtual postfix/cleanup[5793]: connection established postfix/cleanup[5793]: master_notify: status 0 postfix/cleanup[5793]: mail_flow_get: 1 1 postfix/cleanup[5793]: open incoming/288FE67379 postfix/cleanup[5793]: cleanup_open: open incoming/288FE67379 postfix/cleanup[5793]: send attr queue_id = 288FE67379 postfix/cleanup[5793]: cleanup socket: wanted attribute: flags postfix/cleanup[5793]: input attribute name: flags postfix/cleanup[5793]: input attribute value: 115 postfix/cleanup[5793]: cleanup socket: wanted attribute: (list terminator) postfix/cleanup[5793]: input attribute name: (end) postfix/cleanup[5793]: cleanup flags = enable_bad_mail_bounce enable_header_body_filter enable_automatic_bcc enable_address_mapping enable_milters postfix/cleanup[5793]: initial envelope T 1557637132 929471 postfix/cleanup[5793]: initial envelope A rewrite_context=local postfix/cleanup[5793]: initial envelope F root postfix/cleanup[5793]: initial envelope S root postfix/cleanup[5793]: connect to subsystem private/rewrite postfix/cleanup[5793]: send attr request = rewrite postfix/cleanup[5793]: send attr rule = local postfix/cleanup[5793]: send attr address = root postfix/cleanup[5793]: private/rewrite socket: wanted attribute: flags postfix/cleanup[5793]: input attribute name: flags postfix/cleanup[5793]: input attribute value: 0 postfix/cleanup[5793]: private/rewrite socket: wanted attribute: address postfix/cleanup[5793]: input attribute name: address postfix/cleanup[5793]: input attribute value: r...@mydomain.net postfix/cleanup[5793]: private/rewrite socket: wanted attribute: (list terminator) postfix/cleanup[5793]: input attribute name: (end) postfix/cleanup[5793]: rewrite_clnt: local: root -> r...@mydomain.net postfix/cleanup[5793]: initial envelope R user01 postfix/cleanup[5793]: send attr request = rewrite postfix/cleanup[5793]: send attr rule = local postfix/cleanup[5793]: send attr address = user01 postfix/cleanup[5793]: private/rewrite socket: wanted attribute: flags postfix/cleanup[5793]: input attribute name: flags postfix/cleanup[5793]: input attribute value: 0 postfix/cleanup[5793]: private/rewrite socket: wanted attribute: address postfix/cleanup[5793]: input attribute name: address postfix/cleanup[5793]: input attribute value: use...@mydomain.net postfix/cleanup[5793]: private/rewrite socket: wanted attribute: (list terminator) postfix/cleanup[5793]: input attribute name: (end) postfix/cleanup[5793]: rewrite_clnt: local: user01 -> use...@mydomain.net postfix/cleanup[5793]: been_here: ?0?user01?use...@mydomain.net: 0 postfix/cleanup[5793]: initial envelope M postfix/cleanup[5793]: cleanup_header_callback: 'Received: by mail.mydomain.net (Postfix, from userid 0)??id 288FE67379; Sun, 12 May 2019 01:58:52 -0300 (-03)' postfix/cleanup[5793]: dict_pcre_lookup: /etc/postfix/smtp_header_checks: Received: by mail.mydomain.net (Postfix, from userid 0)??id 288FE67379; Sun, 12 May 2019 01:58:52 -0300 (-03) postfix/cleanup[5793]: maps_find: header_checks: pcre:/etc/postfix/smtp_header_checks(0,lock): Received: by mail.mydomain.net (Postfix, from userid 0)??id 288FE67379; Sun, 12 May 2019 01:58:52 -0300 (-03) = IGNORE postfix/cleanup[5793]: cleanup_header_callback: 'Date: Sun, 12 May 2019 01:58:52 -0300' postfix/cleanup[5793]: dict_pcre_lookup: /etc/postfix/smtp_header_checks: Date: Sun, 12 May 2019 01:58:52 -0300 postfix/cleanup[5793]: maps_find: header_checks: Date: Sun, 12 May 2019 01:58:52 -0300: not found postfix/cleanup[5793]: cleanup_header_callback: 'To: user01' postfix/cleanup[5793]: dict_pcre_lookup: /etc/postfix/smtp_header_checks: To: user01 postfix/cleanup[5793]: maps_find: header_checks: To: user01: not found postfix/cleanup[5793]: rewrite_recip: To postfix/cleanup[5793]: rewrite_clnt: cached: local: user01 -> use...@mydomain.net postfix/cleanup[5793]: cleanup_header_callback: 'Subject: hello' postfix/cleanup[5793]: dict_pcre_lookup: /etc/postfix/smtp_header_checks: Subject: hello postfix/cleanup[5793]: maps_find: header_checks: pcre:/etc/postfix/smtp_header_checks(0,lock): Subject: hello = REPLACE Subject: bye postfix/cleanup[5793]: 288FE67379: replace: header Subject: hello from local; from=<r...@mydomain.net> to=<use...@mydomain.net>: Subject: bye postfix/cleanup[5793]: cleanup_header_callback: 'User-Agent: Heirloom mailx 12.5 7/5/10' postfix/cleanup[5793]: dict_pcre_lookup: /etc/postfix/smtp_header_checks: User-Agent: Heirloom mailx 12.5 7/5/10 postfix/cleanup[5793]: maps_find: header_checks: User-Agent: Heirloom mailx 12.5 7/5/10: not found postfix/cleanup[5793]: cleanup_header_callback: 'MIME-Version: 1.0' postfix/cleanup[5793]: dict_pcre_lookup: /etc/postfix/smtp_header_checks: MIME-Version: 1.0 postfix/cleanup[5793]: maps_find: mime_header_checks: MIME-Version: 1.0: not found postfix/cleanup[5793]: header_token: text / plain postfix/cleanup[5793]: cleanup_header_callback: 'Content-Type: text/plain; charset=us-ascii' postfix/cleanup[5793]: dict_pcre_lookup: /etc/postfix/smtp_header_checks: Content-Type: text/plain; charset=us-ascii postfix/cleanup[5793]: maps_find: mime_header_checks: Content-Type: text/plain; charset=us-ascii: not found postfix/cleanup[5793]: header_token: 7bit postfix/cleanup[5793]: cleanup_header_callback: 'Content-Transfer-Encoding: 7bit' postfix/cleanup[5793]: dict_pcre_lookup: /etc/postfix/smtp_header_checks: Content-Transfer-Encoding: 7bit postfix/cleanup[5793]: maps_find: mime_header_checks: Content-Transfer-Encoding: 7bit: not found postfix/cleanup[5793]: 288FE67379: message-id=< 20190512045853.288fe67...@mail.mydomain.net> postfix/cleanup[5793]: extracted envelope E postfix/cleanup[5793]: cleanup_flush: status 0 postfix/cleanup[5793]: send attr status = 0 postfix/cleanup[5793]: send attr reason = postfix/cleanup[5793]: master_notify: status 1 postfix/cleanup[5793]: connection closed postfix/cleanup[5793]: rewrite stream disconnect
