Email::Filter - Library for creating easy email filters
use Email::Filter; my $mail = Email::Filter->new(emergency => "~/emergency_mbox"); $mail->pipe("listgate", "p5p") if $mail->from =~ /perl5-porters/; $mail->accept("perl") if $mail->from =~ /perl/; $mail->reject("We do not accept spam") if $mail->subject =~ /enlarge/; $mail->ignore if $mail->subject =~ /boring/i; ... $mail->exit(0); $mail->accept("~/Mail/Archive/backup"); $mail->exit(1); $mail->accept()
This is another module produced by the "Perl Email Project", a reaction against the complexity and increasing bugginess of the "Mail::*" modules. It replaces Mail::Audit, and allows you to write programs describing how your mail should be filtered.
Mail::Audit
Users of Mail::Audit will note that this class is much leaner than the one it replaces. For instance, it has no logging; the concept of "local options" has gone away, and so on. This is a deliberate design decision to make the class as simple and maintainable as possible.
To make up for this, however, Email::Filter contains a trigger mechanism provided by Class::Trigger, to allow you to add your own functionality. You do this by calling the add_trigger method:
Email::Filter
add_trigger
Email::Audit->add_trigger( after_accept => \&log_accept );
Hopefully this will also help subclassers.
The methods below will list which triggers they provide.
If something bad happens during the accept or pipe method, or the Email::Filter object gets destroyed without being properly handled, then a fail-safe error recovery process is called. This first checks for the existence of the emergency setting, and tries to deliver to that mailbox. If there is no emergency mailbox or that delivery failed, then the program will either exit with a temporary failure error code, queuing the mail for redelivery later, or produce a warning to standard error, depending on the status of the exit setting.
accept
pipe
emergency
exit
Email::Filter->new(); # Read from STDIN Email::Filter->new(data => $string); # Read from string Email::Filter->new(emergency => "~simon/urgh"); # Deliver here in case of error
This takes an email either from standard input, the usual case when called as a mail filter, or from a string.
You may also provide an "emergency" option, which is a filename to deliver the mail to if it couldn't, for some reason, be handled properly.
If you put your constructor in a BEGIN block, like so:
BEGIN
use Email::Filter; BEGIN { $item = Email::Filter->new(emergency => "~simon/urgh"); }
right at the top of your mail filter script, you'll even be protected from losing mail even in the case of syntax errors in your script. How neat is that?
This method provides the new trigger, called once an object is instantiated.
new
$mail->exit(1|0);
Sets or clears the 'exit' flag which determines whether or not the following methods exit after successful completion.
The sense-inverted 'noexit' method is also provided for backwards compatibility with Mail::Audit, but setting "noexit" to "yes" got a bit mind-bending after a while.
$mail->simple();
Gets and sets the underlying Email::Simple object for this filter; see Email::Simple for more details.
Email::Simple
$mail->header("X-Something")
Returns the specified mail headers. In scalar context, returns the first such header; in list context, returns them all.
$mail->body()
Returns the body text of the email
$mail-><header>()
Convenience accessors for header($header)
header($header)
Ignores this mail, exiting unconditionally unless exit has been set to false.
This method provides the "ignore" trigger.
$mail->accept(); $mail->accept(@where);
Accepts the mail into a given mailbox or mailboxes. Unix ~/ and ~user/ prefices are resolved. If no mailbox is given, the default is determined according to Email::LocalDelivery: $ENV{MAIL}, /var/spool/mail/you, /var/mail/you, or ~you/Maildir/.
~/
~user/
$ENV{MAIL}
This provides the before_accept and after_accept triggers, and exits unless exit has been set to false.
before_accept
after_accept
$mail->reject("Go away!");
This rejects the email; if called in a pipe from a mail transport agent, (such as in a ~/.forward file) the mail will be bounced back to the sender as undeliverable. If a reason is given, this will be included in the bounce.
This calls the reject trigger. exit has no effect here.
reject
$mail->pipe(qw[sendmail foo\@bar.com]);
Pipes the mail to an external program, returning the standard output from that program if exit has been set to false. The program and each of its arguments must be supplied in a list. This allows you to do things like:
$mail->exit(0); $mail->simple(Email::Simple->new($mail->pipe("spamassassin"))); $mail->exit(1);
in the absence of decent Mail::SpamAssassin support.
Mail::SpamAssassin
If the program returns a non-zero exit code, the behaviour is dependent on the status of the exit flag. If this flag is set to true (the default), then Email::Filter tries to recover. (See "ERROR RECOVERY") If not, nothing is returned.
Copyright 2003, Simon Cozens <simon@cpan.org>
You may use this module under the terms of the BSD, Artistic, or GPL licenses, any version.
Casey West, casey@geeknest.com
casey@geeknest.com
Simon Cozens, simon@cpan.org
simon@cpan.org
http://pep,kwiki.org
To install Email::Filter, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Email::Filter
CPAN shell
perl -MCPAN -e shell install Email::Filter
For more information on module installation, please visit the detailed CPAN module installation guide.