---
name: "Mail::Audit::KillDups"
section: "3pm"
platform: "linux"
package: "libmail-audit-perl"
version: "2.1-5sarge4"
release: "Debian 3.1 (Sarge)"
platforms: ["linux"]
url: "https://new.carta.tech/Mail::Audit::KillDups"
---

# Mail::Audit::KillDups(3pm)

Mail::Audit::KillDups - Mail::Audit plugin for duplicate suppression

```
    use Mail::Audit qw(KillDups);
    $Mail::Audit::KillDups::dupfile = "/home/simon/.msgid-cache";
        my $mail = Mail::Audit->new;
    $mail->killdups;
```

This is a Mail::Audit plugin which provides a method for checking and supressing duplicate messages; that is, mails with message-ids which have been previously seen.\
 **METHODS** Checks the incoming message against a file of previously seen message ids, ignores it if it's already seen, and adds it if it hasn't been. `$Mail::Audit::KillDups::dupfile` contains the name of the file used; if you don't set this, it will be *.msgid-cache* in the current directory. (Probably your home directory.)

The data in `$Mail::Audit::KillDups::dupfile` will be treated as a ring buffer, where the end of the buffer will be delimited by two newline characters.  When the file size exceeds `$Mail::Audit::KillDups::cache_bytes` bytes, the message id will be written at the beginning of the file.  Old message ids in the file will be overwritten. Simon Cozens \<simon@cpan.org\> Mail::Audit