srfm_user_welcome_email_subject

/**
* filter source (Pro) inc/business/user-registration/processor.php 
*/
 $subject = apply_filters( 'srfm_user_welcome_email_subject', $subject, $user );

/**
* filter source (Pro) inc/business/user-registration/processor.php 
*/
 $subject = apply_filters( 'srfm_user_welcome_email_subject', $subject, $user );

add_filter( 'srfm_user_welcome_email_subject', 'my_callback', 10, 2 );
 function my_callback( $subject, $user ) { 
 return $subject; 
 }

add_filter( 'srfm_user_welcome_email_subject', 'my_callback', 10, 2 );
 function my_callback( $subject, $user ) { 
 return $subject; 
 }

add_filter( 'srfm_user_welcome_email_subject', 'my_callback', 10, 2 );
 function my_callback( $subject, $user ) { 
 return $subject; 
 }

add_filter( 'srfm_user_welcome_email_subject', 'my_callback', 10, 2 );
 function my_callback( $subject, $user ) { 
 return $subject; 
 }