Module: Sisimai::Reason::HostUnknown

Defined in:
lib/sisimai/reason/hostunknown.rb

Overview

This is the error that a domain part ( Right hand side of @ sign ) of a recipient’s email address does not exist. In many case, the domain part is misspelled, or the domain name has been expired. Sisimai will set “hostunknown” to the reason of email bounce if the value of Status: field in a bounce mail is “5.1.2”.

Constant Summary collapse

Index = 
[
  "all host address lookups failed", # Exim/transports/smtp.c:3524
  "couldn't find any host ",         # qmail-remote.c:78
  "dns server returned answer with no data",
  "domain is not reachable",
  "domain mentioned in email address is unknown",
  "domain must exist",
  "domain name not found",
  "host or domain name not found",
  "host unknown",
  "host unreachable",
  "illegal host/domain name found",
  "invalid domain name",                    # OpenSMTPD/smtpd/mta.c:976
  "mx records point to non-existent hosts", # Exim/routers/dnslookup.c:331
  "name or service not known",
  "no such domain",
  "recipient address rejected: unknown domain name",
  "responded with code nxdomain",
  "unknown host",
].freeze
Pairs = 
[
  ["domain ", "not exist"],
  ["host ", " not found"],
  ["unrout", "able ", "address"],
].freeze

Class Method Summary collapse

Class Method Details

.description ⇒ Object 



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# File 'lib/sisimai/reason/hostunknown.rb', line 36

def description; return "Delivery failed due to a domain part of a recipient's email address does not exist"; end

.match(argv1) ⇒ Boolean

Try to match that the given text and regular expressions

Parameters:

  • argv1 (String) —

    String to be matched with regular expressions

Returns:

  • (Boolean) —

    false: Did not match, true: Matched

Since:

  • v4.0.0



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# File 'lib/sisimai/reason/hostunknown.rb', line 42

def match(argv1)
  return false if argv1.nil? || argv1.empty?
  return true  if Index.any? { |a| argv1.include?(a) }
  return true  if Pairs.any? { |a| Sisimai::String.aligned(argv1, a) }
  return false
end

.text ⇒ Object 



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# File 'lib/sisimai/reason/hostunknown.rb', line 35

def text; return 'hostunknown'; end

.true(argvs) ⇒ Boolean

Whether the host is unknown or not

Parameters:

Returns:

  • (Boolean) —

    true: is unknown host false: is not unknown host.

See Also:



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# File 'lib/sisimai/reason/hostunknown.rb', line 54

def true(argvs)
  return true  if argvs['reason'] == 'hostunknown'
  return false if Sisimai::SMTP::Command::BeforeRCPT.include?(argvs['command'])

  issuedcode = argvs['diagnosticcode'].downcase || ''
  statuscode = argvs['deliverystatus'] || ''

  if Sisimai::SMTP::Status.name(statuscode) == 'hostunknown'
    # To prevent classifying DNS errors as "HostUnknown"
    require 'sisimai/reason/networkerror'
    return true if Sisimai::Reason::NetworkError.match(issuedcode) == false
  else
    # Status: 5.1.2
    # Diagnostic-Code: SMTP; 550 Host unknown
    return true if match(issuedcode)
  end

  return false
end