Shows how to conditionally suspend auto-paragraphs with a Participants Database Email Template

pdb-suspend-email-autop.php

add_filter( 'pdb-rich_text_filter_mode', 'suspend_rich_text_for_sms', 10, 2 );

// changes the rich text filtering mode according to content
function suspend_rich_text_for_sms( $format_setting, $content ) {

   // the setting is only altered if the message is an sms message
   if ( content_is_sms( $content ) ) { 
      $format_setting = 'none';
   }

   return $format_setting; // this is the setting that will be used for the current message
}

// check the content
function content_is_sms( $content ) {
  /* this is an example of detecting content that should not have 
  /* auto-paragraphs applied 
  return stripos( $content, 'sms') !== false;
}

When an email is sent using the Participants Database Email Expansion Kit, the body of the email is passed through the rich text filter in Participants Database. There is a global setting for that in the plugin settings.

If you want to suspend or change that setting for a specific email, you have to do it by looking at the content for an indication that a different rule needs to be applied in that case.