apply_filters( 'wp_mail_content_type', string $content_type )

Filters the wp_mail() content type.

Contents

Parameters Parameters

$content_type

(string) Default wp_mail() content type.

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More Information More Information

  • The default content type for email sent through the wp_mail() function is ‘text/plain‘ which does not allow using HTML. However, you can use the wp_mail_content_type filter to change the default content type of the email.
  • In general, content type is going to be ‘text/plain‘ as the default, or ‘text/html‘ for HTML email; but other MIME types are possible.

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Source Source

File: wp-includes/pluggable.php

View on Trac

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Used By Used By

Used By
Used By Description
wp-includes/formatting.php: wp_staticize_emoji_for_email()

Convert emoji in emails into static images.
wp-includes/pluggable.php: wp_mail()

Sends an email, similar to PHP’s mail function.

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Changelog Changelog

Changelog
Version Description
2.3.0 Introduced.

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User Contributed Notes User Contributed Notes

  1. Skip to note 1 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 10You must log in to vote on the helpfulness of this note
    Contributed by Helen Hou-Sandi —

    Switch to HTML formatted email when using wp_mail():

    /**
 * Filter the mail content type.
 */
function wpdocs_set_html_mail_content_type() {
	return 'text/html';
}
add_filter( 'wp_mail_content_type', 'wpdocs_set_html_mail_content_type' );

$to      = 'sendto@example.com';
$subject = 'The subject';
$body    = 'The email body content';

wp_mail( $to, $subject, $body );

// Reset content-type to avoid conflicts -- https://core.trac.wordpress.org/ticket/23578
remove_filter( 'wp_mail_content_type', 'wpdocs_set_html_mail_content_type' );

    Expand full source codeCollapse full source code

  2. Skip to note 2 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note
    Contributed by stevenlinx —

    Examples migrated from Codex:

    The following example will change the default content (mime) type for the wp_mail() function to ‘text/html’:

    add_filter( 'wp_mail_content_type', 'set_content_type' );

function set_content_type( $content_type ) {
	return 'text/html';
}

    The following example shows that it is not necessary to call another method if you can use anonymous functions (PHP 5.3.0+):

    add_filter( 'wp_mail_content_type', function( $content_type ) {
	return 'text/html';
} );

    The following example shows that you could use different MIME types for different purposes by building some conditional logic into your filter:

    add_filter( 'wp_mail_content_type', 'my_mail_content_type' );

function my_mail_content_type( $content_type ) {

    if ( $some_condition ) {
        return 'multipart/mixed';
    } else {
        return 'text/plain';
    }
}
  3. Skip to note 3 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note
    Contributed by stevenlinx —

    Example migrated from Codex:

    If you change the content type to `text/html`, it will cause problems with password reset emails.

    To remedy this, consider:
    modifying the email body of password reset emails to make it work with ‘text/html‘ content type
    OR
    reset the content type back to ‘text/plain‘ after you’re done sending the custom emails ( either by explicitly resetting the content type back to ‘text/plain‘ or by removing the callback function filter that changes the content type to ‘text/html‘ with remove_filter() )

    The following example shows how to use the filter `retrieve_password_message` to make the email body of password reset emails work with ‘text/html‘ content type:

    // adding support for html emails
add_filter( 'wp_mail_content_type','mycustom_set_content_type' );

function mycustom_set_content_type() {
        return "text/html";
}

// also filter the password reset email for compatibility with the HTML format
add_filter( 'retrieve_password_message', 'mycustom_retrieve_password_message', 10, 1 );

function mycustom_retrieve_password_message( $message ) {
        $message = str_replace('<','',$message);
        $message = str_replace('>','',$message);
        $message = str_replace("\n",'<br>',$message);
        return $message;
}

    Expand full source codeCollapse full source code

    The following example shows how to reset the content type back to ‘text/plain‘ by removing the callback function filter that changes the content type to ‘text/html‘ with remove_filter() :

    add_filter( 'wp_mail_content_type', 'set_content_type' );
 
function set_content_type( $content_type ) {
    return 'text/html';
}

remove_filter( 'wp_mail_content_type', 'set_content_type' );

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