The mail_filter callback is invoked just prior to Movable Type sending an email.

Input Parameters

• $cb - a reference to the current MT::Callback object handling this event.
• $params - a hash ref containing information about the email being sent.

The following are the keys of the parameter ($params) hash passed into the handler as input:

• args - a reference to all of the arguments passed to MT::Mail->send
• headers - a reference to an associative array containing all of the SMTP headers for the email.
• body - the text of the email
• transfer - the value of MailTransfer (sendmail or smtp)
• id - the ID of the template in string form, effectively identifying the email type, used to generate this email (optional)

Return Value

None.

Example Handler

sub handler {
    my ($cb, $params) = @_;
    $params->{headers}->{Content-Type} = "text/html";
}