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- # Non-critical routine operations involving suspicious wording
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/local\[[0-9]+\]: warning: unable to create lock file /var/mail/[[:alnum:]]+\.lock: Permission denied$
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/(local|smtpd)\[[0-9]+\]: warning: [\.0-9]+: hostname [^[:space:]]+ verification failed: .*$
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/(local|smtpd)\[[0-9]+\]: warning: reject: ETRN [^[:space:]]+\.\.\. from [^[:space:]]+\[[\.0-9]+\]$
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/[ls]mtp\[[0-9]+\]: [[:xdigit:]]+: ((to|orig_to|relay|conn_use|delay|delays|dsn)=[^[:space:]]+, )+status=(sent|bounced|deferred) \((\(.*\)|[^\(\)]*)*\)( proto=E?SMTP helo=<[^>]*>)?$
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/smtpd\[[0-9]+\]: ([[:xdigit:]]+|NOQUEUE): reject: (DATA|MAIL|RCPT) from [^[:space:]]+\[[\.0-9]+\]: .*$
- # Certificate handling is non-fatal
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/smtp\[[0-9]+\]: [[:xdigit:]]+: Cannot start TLS: handshake failure$
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/smtp\[[0-9]+\]: [[:xdigit:]]+: Could not start TLS: client failure$
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/smtp\[[0-9]+\]: (Unv|V)erified: subject_CN=.*, issuer=.*
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/smtp\[[0-9]+\]: certificate peer name verification failed for [^[:space:]]+: (CommonName mis-match:.*|[0-9]+ dNSNames in certificate found, but none matches)$
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/smtp\[[0-9]+\]: certificate verification failed for [^[:space:]]+:( num=7:certificate signature failure|( num=10:)?certificate has expired| num=24:invalid CA certificate)$
- # Remote hosts refusing to talk is not a security thread
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/qmgr\[[0-9]+\]: [[:xdigit:]]+: ((to|relay|delay|delays|dsn)=[^[:space:]]+, )status=deferred \(delivery temporarily suspended: host [^[:space:]]+\[[\.0-9]+\] refused to talk to me: .*$
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/smtp\[[0-9]+\]: [[:xdigit:]]+: host [^[:space:]]+\[[\.0-9]+\] refused to talk to me: .*$
- # Suspiciously worded hostname or email address is not a security thread
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/[[:alnum:]]+\[[0-9]+\]: ([[:xdigit:]]+|NOQUEUE): ([^[:space:]]+=[^[:space:]]+, )*(from|helo|message-id|to)=<[^>]*(DEBUG|ERROR|EXPN|FAILURE|Failed|ILLEGAL|PERMITTED|REFUSED|VRFY|BAD|debug|denied|deny|expn|failed|failure|illegal|permitted|promisc|reject|rexec|rshd|securityalert|setsender|shutdown|smrsh|sucked|unapproved|unauthorized|vrfy)[^>]*>.*$
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/[[:alnum:]]+\[[0-9]+\]: warning: no MX host for [^[:space:]]*(DEBUG|ERROR|EXPN|FAILURE|Failed|ILLEGAL|PERMITTED|REFUSED|VRFY|BAD|debug|denied|deny|expn|failed|failure|illegal|permitted|promisc|reject|rexec|rshd|securityalert|setsender|shutdown|smrsh|sucked|unapproved|unauthorized|vrfy)[^[:space:]]* has a valid A record$
- ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ postfix/smtp+\[[0-9]+\]: connect to [^[:space:]]*(DEBUG|ERROR|EXPN|FAILURE|Failed|ILLEGAL|PERMITTED|REFUSED|VRFY|BAD|debug|denied|deny|expn|failed|failure|illegal|permitted|promisc|reject|rexec|rshd|securityalert|setsender|shutdown|smrsh|sucked|unapproved|unauthorized|vrfy)[^[:space:]]*:.*$
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