apply_filters( ‘wp_mail_content_type’, string $content_type )

User Contributed Notes

1. Skip to note 5 content

   Helen Hou-Sandi 10 years ago

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   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' );
2. Skip to note 6 content

   UrlDev 3 years ago

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   Follow the bellow code snippet to set wp_mail(); content type without using add_filter( 'wp_mail_content_type', 'your_function_name' );.

   To send HTML formatted mail, you can specify the Content-Type HTTP header in the $headers parameter:

   $to = 'sendto@example.com';
   $subject = 'The subject';
   $body = 'The email body content';
   $headers = array( 'Content-Type: text/html; charset=UTF-8' );
    
   wp_mail( $to, $subject, $body, $headers );

   That’s all about it. Thank you!
3. Skip to note 7 content

   Steven Lin 4 years ago

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   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';
       }
   }
4. Skip to note 8 content

   Steven Lin 4 years ago

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   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;
   }

   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' );