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// < a href = "./index.html" > Document Index< / a > < / div > < h1 id = "turn-on-debug-mode-in-postfix" > Turn on debug mode in Postfix< / h1 >
< p > There're few ways to turn on debug mode in Postfix, you can choose the one you
prefer.< / p >
< h2 id = "verbose-logging-for-specific-smtp-connections" > Verbose logging for specific SMTP connections< / h2 >
< p > To debug smtp connection from particular client or sender server, list client
hostname or IP address in the < code > debug_peer_list< / code > parameter (in
< code > /etc/postfix/main.cf< / code > ). For example:< / p >
< pre > < code > debug_peer_list = 192.168.0.1
< / code > < / pre >
< p > You can specify one or more hosts, domains, addresses or net/masks. Execute
command < code > postfix reload< / code > to make the change effective immediately.< / p >
< h2 id = "making-postfix-daemon-programs-more-verbose" > Making Postfix daemon programs more verbose< / h2 >
< p > There're many daemon services defined in < code > /etc/postfix/master.cf< / code > , for example:< / p >
< pre > < code > smtp inet n - n - - smtpd
< / code > < / pre >
< p > To make Postfix logging verbose info of this daemon, please append one or more
< code > -v< / code > options to selected daemon and execute command < code > postfix reload< / code > .< / p >
< pre > < code > smtp inet n - n - - smtpd -v
< / code > < / pre >
< ul >
< li > To diagnose problems with address rewriting specify a < code > -v< / code > option for the
< code > cleanup(8)< / code > and/or < code > trivial-rewrite(8)< / code > daemon.< / li >
< li > To diagnose problems with mail delivery specify a < code > -v< / code > option for the
< code > qmgr(8)< / code > or < code > oqmgr(8)< / code > queue manager, or for the < code > lmtp(8)< / code > , < code > local(8)< / code > ,
< code > pipe(8)< / code > , < code > smtp(8)< / code > , or < code > virtual(8)< / code > delivery agent.< / li >
< / ul >
< h2 id = "see-also" > See also< / h2 >
< ul >
< li > < a href = "http://www.postfix.org/DEBUG_README.html" > Postfix Debugging Howto< / a > < / li >
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