postfix/(qmgr|smtp)\[[0-9]+\]: .* status=deferred \(connect to .*: (Connection refused|server refused mail service)\)
postfix/cleanup\[[0-9]+\]: [A-Z0-9]+: message-id=<.*@Debug>
postfix/local\[[0-9]+\]: warning: unable to create lock file /var/mail/[[:alnum:]]+\.lock: Permission denied
postfix/smtp\[[0-9]+\]: .* status=bounced \(bad host/domain syntax: ".*"\)
postfix/smtp\[[0-9]+\]: .* status=bounced \(Name service error for .*: Host not found\)
postfix/smtp\[[0-9]+\]: .* status=bounced \(host .* said: 550 .* (User unknown; rejecting|Relaying denied|unknown or illegal alias: .*)\)
postfix/smtp\[[0-9]+\]: .* status=bounced \(host .* said: 552 header content rejected: see .*\)
postfix/smtp\[[0-9]+\]: .* status=deferred \(host .* said: 450 <.*>: Sender address rejected: Domain not found\)
postfix/smtp\[[0-9]+\]: .* status=deferred \(host .* said: 450 <.*>: Recipient address rejected: Recipient mailbox is full\)
postfix/smtp\[[0-9]+\]: .* status=deferred \(host .* said: 451 Transaction failed.\)
postfix/smtp\[[0-9]+\]: connect to .*\[[\.[:digit:]]+\]: (Connection refused|server refused mail service) \(port 25\)
postfix/smtpd\[[0-9]+\]: reject: RCPT from .*\[[\.[:digit:]]+\]: 550 <.*>: User unknown; from=<.*> to=<.*>
postfix/smtpd\[[0-9]+\]: reject: RCPT from .*\[[\.[:digit:]]+\]: 554 Service unavailable; .* blocked using .*; from=<.*> to=<.*>
postfix/smtpd\[[0-9]+\]: reject: RCPT from .*\[[\.[:digit:]]+\]: 554 <.*>: (Recipient address rejected: )?(Relay a|A)ccess denied; from=<.*> to=<.*>
postfix/smtpd\[[0-9]+\]: warning: .*: hostname .* verification failed: Host not found