Contact Form 7: Automatically send with username and email

Is there also a way to take a email address from a customfield from the post/page where the form is placed?

Hi,

my problem is the same. I need the forms sent to me, with the logged user name in it. I tried modifying special-mail-tags.php as Jacob Smith said, and it worked. The mail was sent with the user name using a [user_login] tag. But, when I tried to log out, I got problems:

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-login.php on line 337

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-login.php on line 349

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 717

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 718

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 719

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 720

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 721

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 722

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 725

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 726

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 727

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 728

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 731

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 732

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 733

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 734

Warning: Cannot modify header information - headers already sent by (output started at /XXX/wp-content/plugins/contact-form-7/modules/special-mail-tags.php:86) in /XXX/wp-includes/pluggable.php on line 890

What did I do wrong? Could you please give the full special-mail-tags.php text so that I can use it in my site?

Thanks a lot.

@propulso: Just saw your comments now.

Here is the full contents of my special-mail-tags.php:

<?php
/**
** Filters for Special Mail Tags
**/

add_filter( 'wpcf7_special_mail_tags', 'wpcf7_special_mail_tag', 10, 2 );

function wpcf7_special_mail_tag( $output, $name ) {

    // For backwards compat.
    $name = preg_replace( '/^wpcf7\./', '_', $name );

    if ( '_remote_ip' == $name )
        $output = preg_replace( '/[^0-9a-f.:, ]/', '', $_SERVER['REMOTE_ADDR'] );

    elseif ( '_url' == $name )
        $output = get_option( 'home' ) . wpcf7_get_request_uri();

    elseif ( '_date' == $name )
        $output = date_i18n( get_option( 'date_format' ) );

    elseif ( '_time' == $name )
        $output = date_i18n( get_option( 'time_format' ) );

    return $output;
}

add_filter( 'wpcf7_special_mail_tags', 'wpcf7_special_mail_tag_for_post_data', 10, 2 );

function wpcf7_special_mail_tag_for_post_data( $output, $name ) {

    if ( ! isset( $_POST['_wpcf7_unit_tag'] ) || empty( $_POST['_wpcf7_unit_tag'] ) )
        return $output;

    if ( ! preg_match( '/^wpcf7-f(\d+)-p(\d+)-o(\d+)$/', $_POST['_wpcf7_unit_tag'], $matches ) )
        return $output;

    $post_id = (int) $matches[2];

    if ( ! $post = get_post( $post_id ) )
        return $output;

    $user = new WP_User( $post->post_author );

    // For backwards compat.
    $name = preg_replace( '/^wpcf7\./', '_', $name );

    if ( '_post_id' == $name )
        $output = (string) $post->ID;

    elseif ( '_post_name' == $name )
        $output = $post->post_name;

    elseif ( '_post_title' == $name )
        $output = $post->post_title;

    elseif ( '_post_url' == $name )
        $output = get_permalink( $post->ID );

    elseif ( '_post_author' == $name )
        $output = $user->display_name;

    elseif ( '_post_author_email' == $name )
        $output = $user->user_email;

    return $output;
}

add_filter( 'wpcf7_special_mail_tags', 'wpcf7_special_mail_tag_userdata', 10, 2 );

function wpcf7_special_mail_tag_userdata( $output, $name ) {

// For backwards compat.

$name = preg_replace( '/^wpcf7\./', '_', $name );

global $current_user;

if ( 'user_login' == $name )
$output = $current_user->user_login;

return $output;
}

?>

I hope it helps; I haven’t encountered that error.

It seems that that kind of error can be related to spaces before and/or after PHP code in various files:
http://www.hongkiat.com/blog/wordpress-error-warning-cannot-modify-header-information/

It would be great if this became a DEFAULT option otherwise everytime there is an update of the plugin this gets overwritten.

If a blog user is logged in, then the email/name should be pre-populated by default.