Got a packet bigger than 'max_allowed_packet' bytes

Got a packet bigger than 'max_allowed_packet' bytes

my.cnf

max_allowed_packet =5020M

net_buffer_length=5024M;

bulk_insert_buffer_size=1256M

 $mysql_i_arr .="($wdate,\"$Ins_News_db_lib->homepage_url\",$uid,1,\"\",\"$memEmail_db\",\"$m_from_name_db\",\"$m_from_email_db\",\"$title\",\"$body_tmp\",\"$send_date_db\"),";

 $mysql_i_arr = substr( $mysql_i_arr,0,-1); 

$sql2="insert into $Table2(wdate,domain,uid_key,ok,to_name,to_email,from_name,from_email,title,body,send_date) values $mysql_i_arr";