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authorJannis Hoffmann <jannis@fehcom.de>2024-07-03 15:48:04 +0200
committerJannis Hoffmann <jannis@fehcom.de>2024-07-03 15:48:04 +0200
commit89b7b67a13ebb7965cc7f13ad0595e2194a2d34c (patch)
tree25efd77a90ae87236e6730d8ea3846bbe0fd126f /doc/LOGGING
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+Logging of SMTP Sessions
+========================
+
+Normally, qmail-smtpd doesn't log anything.
+
+Within s/qmail, qmail-smtpd logs some accepted and some (important) rejected SMTP session attempts.
+
+Format: "qmail-smtpd: pid PID Action::Type::Condition: Information"
+
+In order to track a complete SMTP transaction (including tcpserver/sslserver + rblsmtpd)
+the log line includes now the PID.
+
+Here's the glue:
+
+
+ Action Type Condition Explanation
+ -----------------------------------------
+
+ Reject AUTH missing AUTHentication missing
+ Reject AUTH setup AUTHentication impossible due to missing PAM
+ Reject AUTH type AUTHentication of 'type' rejected
+ Reject Auth Method AUTHentication Method rejected
+ Accept AUTH type AUTHentication of 'type' accepted
+
+ Reject DATA Invalid_Size DATA exceeds sizelimit
+ Reject DATA Bad_MIME DATA includes BASE 64 MIME type listed in badmimetypes
+ Reject DATA Bad_Loader DATA includes BASE64 loader type listed in badmimetypes
+ Reject DATA Virus_Infected DATA includes virus infected message (<scanner> | 'AV scanner')
+ Reject DATA Spam_Message DATA includes an identified Spam message.
+
+ Reject ORIG Bad_Mailfrom ORIG is in badmailfrom
+ Reject ORIG DNS_MF Domain part of ORIG has no DNS MX RR
+ Reject ORIG Failed_Auth ORIG tried SMTP Authentication; but failed
+ Reject ORIG Require_Auth SMTP Authentication required; but not granted
+ Reject ORIG Invalid_Sender ORIG not allowed to send
+ Reject ORIG Missing_Auth SMTP Authentication required, but not granted
+ Reject ORIG SPF ORIG was rejected due to failed SPF permissions
+ Accept ORIG Local_Sender ORIG was identified as local sender address
+ Accept ORIG Relay_Mailfrom ORIG was accepted als Relaymailfrom
+
+ Reject RCPT Bad_Rcptto RCPT is in badrcptto
+ Reject RCPT Toomany_Rcptto Too many RCPTs
+ Reject RCPT Failed_Rcptto RCPT could not acceptd as per recipients/cdb.
+ Accept RCPT Recipients_Cdb RCPT was accepted as per recipients/cdb.
+ Accept RCPT Recipients_Pam RCPT was accepted as per recipients/pam plug-in.
+ Accept RCPT Recipients_Wild RCPT was accepted as per recipients/wildlisting.
+ Accept RCPT Rcpthosts_Rcptto RCPT was accepted as per rcpthosts/morercpthosts
+
+ Reject SNDR Bad_Helo SNDR's HELO is in the badhelo
+ Reject SNDR DNS_HELO SNDR's HELO has no DNS A RR
+ Reject SNDR Invalid_Relay SNDR's tries relaying; but not allowd
+ Accept SNDR Relay_Client SNDR was identified as relay client
+
+ Reject TLS missing TLS connection could not be established
+ Reject TLS required TLS connection could not be established
+
+ Accept SPF Recipients_Cdb ORIG was authorized and RCPT accepted as per recipients/cdb.
+ Accept SPF Recipients_Pam ORIG was authorized and RCPT accepted as per recipients/pam plug-in.
+ Accept SPF Recipients_Wild ORIG was authorized and RCPT was accepted as per recipients/wildlisting.
+ Accept SPF Rcpthosts_Rcptto ORIG was authorized and RCPT was accepted as per rcpthosts/morercpthosts
+
+ Reject SPF Fail ORIG authorization failed per SPF
+
+ Deferred GREY Grey_Listed SNDR was temporarily greylisted
+
+ Reject DKIM Signature DATA failed DKIM verification
+
+
+SNDR (S) corresponds to the sending MTA.
+ORIG (F) is the "MAIL From: <Return-Path>".
+RCPT (T) is the "RCPT To: <Forwarding-Path>".
+DATA is the Message.
+GREY is triple of envelope data: SNDR+ORIG+RCPT.
+
+Protocol
+--------
+ SMTP plain SMTP
+ ESMTP 'enhanced' SMTP
+ ESMTPA ESMTP + authentication
+ ESMPTS TLS secured EMSTP
+ ESMTPSA TLS secured ESMTP + auth
+ ESMTP[SA]UTF8 ESMTP[SA] with UTF-8
+
+
+
+The Information is typically constructed from the SMTP envelope like:
+
+ S:IP:FQDN P:Protocol H:Helo F:Mailfrom T:Rcptto
+
+
+This scheme is easy extendable to other successful/deferred SMTP sessions.
+
+In addition for POP3 services this scheme is used; but now logging takes place on FD 5.
+