Add documentation in POD format.
- Add POD. - Drop checkmail.readme. Signed-off-by: Thomas Hochstein <thh@inter.net>
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Thomas Hochstein
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checkmail.pl
235
checkmail.pl
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@ -335,3 +335,238 @@ sub connection_failed {
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print " > Connection failure.\n" if !($options{'q'});
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return 1;
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}
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__END__
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################################ Documentation #################################
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=head1 NAME
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checkmail - check deliverability of a mail address
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=head1 SYNOPSIS
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B<checkmail> [B<-Vhqlr>] [B<-m> I<host>] I<address>|B<-f> I<file>
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=head1 REQUIREMENTS
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=over 2
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=item -
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Perl 5.8 or later
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=item -
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File::Basename
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=item -
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Getopt::Std
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=item -
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Net::DNS I<(CPAN)>
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=item -
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Net::SMTP
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=back
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Furthermore you'll need a working DNS installation.
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=head1 DESCRIPTION
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checkmail checks the vailidity / deliverability of a mail address.
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You may submit just one address as the last argument or a file
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containing one address on each line using the B<-f> option.
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=head2 Configuration
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For the time being, all configuration is done in the script. You have
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to set the following elements of the %config hash:
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=over 4
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=item B<$config{'helo'}>
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The hostname to be used for I<HELO> or I<EHLO> in the SMTP dialog.
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=item B<$config{'from'}>
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The sender address to be used for I<MAIL FROM> while testing.
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=item B<$config{'rand'}>
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A "random" local part to construct a reliably invalid address for use
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with the B<-r> option.
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=back
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=head2 Usage
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After configuring the script you may run your first test with
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checkmail user@example.org
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B<checkmail> will try to determine the mail exchanger(s) (MX)
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responsible for I<example.org> by querying the DNS for the respective
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MX records and then try to connect via SMTP (on port 25) to each of
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them in order of precedence (if necessary). It will run through the
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SMTP dialog until just before the I<DATA> stage, i.e. doing I<EHLO>,
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I<MAIL FROM> and I<RCPT TO>. If no MX is defined, B<checkmail> will
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fall back to the I<example.org> host itself, provided there is at
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least one A record defined in the DNS. If there are neither MX nor A
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records for I<example.org>, mail is not deliverable and B<checkmail>
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will fail accordingly. If no host can be reached, B<checkmail> will
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fail, too. Finally B<checkmail> will fail if mail to the given
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recipient is not accepted by the respective host.
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If B<checkmail> fails, you'll not be able to deliver mail to that
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address - at least not using the configured sender address and from
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the host you're testing from. However, the opposite is not true: a
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mail you send may still not be delivered even if a test via
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B<checkmail> succeeds. The receiving entity may reject your mail after
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the I<DATA> stage, due to content checking or without any special
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reason, or it may even drop, filter or bounce your mail after finally
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accepting it. There is no way to be sure a mail will be accepted short
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of sending a real mail to the address in question.
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You may, however, try to detect hosts that will happily accept any and
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all recipient in the SMTP dialog and just reject your mail later on,
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for example to defeat exactly the kind of check you try to do.
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B<checkmail> will do that by submitting a recipient address that is
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known to be invalid; if that address is accepted, too, you'll know
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that you can't reliably check the validity of any address on that
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host. You can force that check by using the B<-r> option.
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If you don't want to see just the results of your test, you can get a
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B<complete log> of the SMTP dialog by using the B<-l> option. That may be
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helpful to test for temporary failure conditions.
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On the other hand you may use the B<-q> option to suppress all output;
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B<checkmail> will then terminate with one of the following B<exit
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status>:
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=over 4
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=item B<0>
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address(es) seem/seems to be valid
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=item B<1>
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temporary error (connection failure or temporary failure)
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=item B<2>
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address is invalid
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=item B<3>
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address cannot reliably be checked (test using B<-r> failed)
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=back
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You can do B<batch processing> using B<-f> and submitting a file with
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one address on each line. In that case the exit status is set to the
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highest value generated by testing all addresses, i.e. it is set to
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B<0> if and only if no adress failed, but to B<2> if even one address
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failed and to B<3> if even one addresses couldn't reliably be checked.
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And finally you can B<suppress DNS lookups> for MX and A records and
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just force B<checkmail> to connect to a particular host using the
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B<-m> option.
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B<Please note:> You shouldn't try to validate addresses while working
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from a dial-up or blacklisted host. If in doubt, use the B<-l> option
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to have a closer look on the SMTP dialog yourself.
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=head1 OPTIONS
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=over 3
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=item B<-V> (version)
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Print out version and copyright information on B<checkmail> and exit.
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=item B<-h> (help)
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Print this man page and exit.
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=item B<-q> (quit)
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Suppress output and just terminate with a specific exit status.
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=item B<-l> (log)
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Log and print out the whole SMTP dialog.
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=item B<-r> (random address)
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Also try a reliably invalid address - defined in B<$config{'rand'}> -
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to catch hosts that try undermine address verification.
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=item B<-m> I<host> (MX to use)
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Force a connection to I<host> to check deliverability to that
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particular host irrespective of DNS entries. For example:
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checkmail -m test.host.example user@domain.example
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=item B<-f> I<file> (file)
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Process all addresses from I<file> (one on each line).
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=back
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=head1 INSTALLATION
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Just copy checkmail to some directory and get started.
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You can run your first test with
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checkmail user@example.org
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=head1 ENVIRONMENT
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See documentation of I<Net::DNS::Resolver>.
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=head1 FILES
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=over 4
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=item F<checkmail.pl>
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The script itself.
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=back
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=head1 BUGS
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Please report any bugs or feature request to the author or use the
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bug tracker at L<http://bugs.th-h.de/>!
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=head1 SEE ALSO
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L<http://th-h.de/download/scripts.php> will have the current
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version of this program.
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This program is maintained using the Git version control system. You
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may clone L<git://code.th-h.de/mail/checkmail.git> to check out the
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current development tree or browse it on the web via
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L<http://code.th-h.de/?p=mail/checkmail.git>.
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=head1 AUTHOR
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Thomas Hochstein <thh@inter.net>
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=head1 COPYRIGHT AND LICENSE
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Copyright (c) 2002-2010 Thomas Hochstein <thh@inter.net>
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This program is free software; you may redistribute it and/or modify it
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under the same terms as Perl itself.
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=cut
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126
checkmail.readme
126
checkmail.readme
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@ -1,126 +0,0 @@
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NAME
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checkmail
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SYNOPSIS
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checkmail.pl [-hqlr] [-m <host>] -f <file>|<address>
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DESCRIPTION
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checkmail prüft die Zustellbarkeit von E-Mail-Adressen. Es ist
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entweder die zu prüfende Adresse als letztes Argument oder
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mit dem Parameter -f eine Datei mit zu prüfenden Adressen zu
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übergeben.
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Argumente:
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-h
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Mit dem Argument -h wird eine kurze Hilfe ausgegeben.
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-q
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Mit dem Argument -q werden alle Ausgaben unterdrückt;
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das Script beendet sich nur mit einem Exit-Status zwischen
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0 und 3.
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-l
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Mit dem Argument -l wird ein ausführliches Logging des
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SMTP-Dialogs aktiviert.
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-r
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Mit dem Argument -r wird auch eine gezielt ungültige Adresse
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geprüft, um festzustellen, ob der Host nicht einfach jede
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Mailadresse ohne Prüfung akzeptiert.
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-m
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Mit dem Argument -m, gefolgt nach Leerzeichen von einem
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Hostnamen, kann statt der Abfrage des für die Domain
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zuständigen Hosts per DNS die Zustellfähigkeit bei einem
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bestimmten Host geprüft werden.
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Beispiel: checkmail.pl -m test.host.example mail@domain.example
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-f
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Mit dem Argument -f, gefolgt nach Leerzeichen von einem
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Dateinamen, kann eine ganze Reihe von zu prüfenden Mailadressen
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aus einer Datei eingelesen werden, die jeweils eine Adresse
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pro Zeile enthält.
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Beispiel: checkmail.pl -f adressen.txt
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Basiskonfiguration:
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Die Basiskonfiguration erfolgt innerhalb des Scripts. Anzugeben
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sind:
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$config{'helo'}:
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Der im SMTP-Dialog für HELO/EHLO zu verwendende Hostname.
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$config{'from'}:
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Die Absenderadresse (Envelope-From:) für den Test.
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$config{'rand'}:
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Der Localpart der für den Parameter -r erforderlichen
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zufälligen Adresse.
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Funktionsweise:
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Vor dem ersten Aufruf ist innerhalb des Scripts die
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Basiskonfiguration vorzunehmen.
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Danach kann das Script unter Angabe der zu prüfenden E-Mail-Adresse
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aufgerufen werden. Es versucht den oder die zuständigen MX (Mail
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eXchanger) für die Domain der Mailadresse zu ermitteln (ggf., falls
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nicht vorhanden, an den entsprechenden Host zuzustellen), nach dort
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zu verbinden und den SMTP-Dialog bis zum "RCPT TO:" durchzuführen,
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um dann die Antwort des Mailservers auszuwerten.
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Um Mailserver zu erkennen, die zunächst jede Mailadresse akzeptieren
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und unerwünschte Mail erst später bouncen oder unterdrücken, kann
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danach ein weiterer Test mit einer sicher ungültigen Mailadresse
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ausgeführt werden (-r).
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Nicht nur das Ergebnis des Tests, sondern auch der Dialog mit dem
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Mailserver kann vermittels des Parameters -l ausgegeben werden; dies
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ist hilfreich, um auszuschließen, daß die die Testverbindung aus
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andere Gründen abgewiesen wird.
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Wenn (gar) keine Textausgabe gewünscht ist, kann diese vermittels -q
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unterdrückt werden; das Script beendet sich dann mit einem der vier
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folgenden Statuscodes:
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0: Adresse gültig oder Massenaufruf (-f)
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1: Adresse ungültig
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2: Adresse kann nicht geprüft werden (-r und negativer Test)
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3: temporärer Fehler
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Mehrere Mailadressen können mit Hilfe des Parameters -f innerhalb
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einer Datei (eine Adresse pro Zeile) übergeben werden; in diesem
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Fall wird immer der Status "0" zurückgegeben.
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Schließlich kann mit Hilfe des Parameters -m die DNS-Abfrage
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unterdrückt und die Verbindung zu einem bestimmten Host erzwungen
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werden.
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Hinweis: Der Test sollte nicht von einem Dialup-Host oder einem Host
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auf einer sonstigen Blacklist aus durchgeführt werden! Ggf. kann ein
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erneuter Aufruf von checkmail.pl -l für Klarheit sorgen, ob der Test
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wegen der Auswertung einer Blacklist - unabhängig von der verwendeten
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Adresse - fehlschlägt.
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DEPENDANCIES
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Die folgenden CPAN-Module werden neben Perl 5.6.1 oder höher benötigt:
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Net::DNS
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BUGS
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- Fehler und Fehleingaben werden größtenteils nicht abgefangen.
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Weitere Bugs nimmt <thh@inter.net> gerne entgegen.
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AUTHOR
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Thomas Hochstein <thh@inter.net>
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VERSION
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V 0.2 [beta]
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COPYRIGHT
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© 2002-2005 Thomas Hochstein.
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See source for license und warranty.
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