just tried on centos - it's not work =( 250-SIZE 52428800 Set size to 52428800 ! 250-PIPELINING 250-STARTTLS 250 HELP 250 OK 250 Accepted 354 Enter message, ending with "." on a line by itself Sending large buffer, please wait... 552 Message size exceeds maximum permitted 250 OK maybe because "552 Message size exceeds maximum permitted"??